Final Thoughts on Chemistry for 28244-94-2

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Facile Cu(OTf)2-Catalyzed Preparation of Per-O-acetylated Hexopyranoses with Stoichiometric Acetic Anhydride and Sequential One-Pot Anomeric Substitution to Thioglycosides under Solvent-Free Conditions

Solvent-free per-O-acetylation of hexoses with a stoichiometric amount of acetic anhydride employing 0.03 mol % Cu(OTf)2 proceeded in high yields (90-99%) at room temperature to give exclusively pyranosyl products as an anomeric mixture, the alpha/beta ratio of which was dependent on the temperature and amount of catalyst used. Sequential anomeric substitution with p-thiocresol in the presence of BF3¡¤etherate gave the thioglycosides, isolated exclusively or predominantly as one anomer in 66-75% yields.

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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

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TMSBr-mediated solvent- and work-up-free synthesis of alpha-2-deoxyglycosides from glycals

The thio-additions of glycals were efficiently promoted by a stoichiometric amount of trimethylsilyl bromide (TMSBr) to produce S-2-deoxyglycosides under solvent-free conditions in good to excellent yields. In addition, with triphenylphosphine oxide as an additive, the TMSBr-mediated direct glycosylations of glycals with a large range of alcohols were highly alpha-selective.

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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

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Simple and efficient per-O-acetylation of carbohydrates by lithium perchlorate catalyst

Lithium perchlorate is demonstrated to be a highly efficient and convenient catalyst for the per-O-acetylation of various saccharides with excellent yields. Graphical Abstract

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Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Properties and Exciting Facts About 4-Methylphenyl 2,3,4,6-tetra-O-acetyl-1-thio-¦Â-D-glucopyranoside

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28244-94-2, Name is 4-Methylphenyl 2,3,4,6-tetra-O-acetyl-1-thio-¦Â-D-glucopyranoside, molecular formula is C21H26O9S, belongs to Tetrahydropyrans compound, is a common compound. In a patnet, assignee is Gu Guofeng28244-94-2, once mentioned the new application about 28244-94-2

Based on 3 type Streptococcus pneumoniae capsular polysaccharide of the oligosaccharide conjugate and its preparation method and application (by machine translation)

The invention relates to a based on Streptococcus pneumoniae 3 type capsular polysaccharide of the oligosaccharide conjugate and its preparation method and application. A Streptococcus pneumoniae 3 type capsule polysaccharide related oligosaccharide conjugate, the general structure is as follows: The invention provides the Streptococcus pneumoniae 3 type capsule polysaccharide related oligosaccharide synthesis of derivatives, Streptococcus pneumoniae 3 type capsule polysaccharide related oligosaccharide derivatives can be used for preparing against 3 type of Streptococcus pneumoniae model oligosaccharide – protein combination vaccine. (by machine translation)

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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

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Electrochemical O-glycosylation using thioglycosides as glycosyl donors in the presence of a catalytic amount of sodium trifluoromethanesulfonate as a supporting electrolyte

Electrochemical O-glycosylation of primary alcohols with O-protected thioglycosides was performed in the presence of a small amount of sodium trifluoromethansulfonate (12.5 mol % to glycosyl acceptor) as a supporting electrolyte. The reaction was successfully carried out in an undivided cell to give O-glycosides in good yields with a high electro-efficiency (ca. 1 F/mol) at 15 C in acetonitrile.

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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

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A Sugar-Based Gelator for Marine Oil-Spill Recovery

Marine oil spills constitute an environmental disaster with severe adverse effects on the economy and ecosystem. Phase-selective organogelators (PSOGs), molecules that can congeal oil selectively from oil?water mixtures, have been proposed to be useful for oil-spill recovery. However, a major drawback lies in the mode of application of the PSOG to an oil spill spread over a large area. The proposed method of using carrier solvents is impractical for various reasons. Direct application of the PSOG as a solid, although it would be ideal, is unknown, presumably owing to poor dispersion of the solid through the oil. We have designed five cheap and easy-to-make glucose-derived PSOGs that disperse in the oil phase uniformly when applied as a fine powder. These gelators were shown to selectively congeal many oils, including crude oil, from oil?water mixtures to form stable gels, which is an essential property for efficient oil-spill recovery. We have demonstrated that these PSOGs can be applied aerially as a solid powder onto a mixture of crude oil and sea water and the congealed oil can then be scooped out. Our innovative mode of application and low cost of the PSOG offers a practical solution to oil-spill recovery.

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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Downstream synthetic route of 28244-94-2

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28244-94-2, 4-Methylphenyl 2,3,4,6-tetra-O-acetyl-1-thio-¦Â-D-glucopyranoside is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated,28244-94-2

General procedure: Glycosyl sulfide (0.25 mmol) and urea hydrogen peroxide (1.5 equiv) was stirred inacetic acid (2.5 mL) at room temperature for 5 minutes and heated at 60 C for 1.5-2.5hour (as per Table 2 in the manuscript). After completion, the reaction mixture wascooled to room temperature and diluted with EtOAc (30 ml). The organic layer waswashed with saturated NaHCO3 followed by brine solution and dried over anhydrousNa2SO4. Further, the organic layer was evaporated and purified in columnchromatography to obtain the corresponding glycosyl sulfoxides.

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Reference£º
Article; Singh, Adesh Kumar; Tiwari, Varsha; Mishra, Kunj Bihari; Gupta, Surabhi; Kandasamy, Jeyakumar; Beilstein Journal of Organic Chemistry; vol. 13; (2017); p. 1139 – 1144;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

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General procedure: To a stirred solution of tetra-acetylthioglycoside (2.5 g) in dry MeOH, a catalytic amountof NaOMe (31.33 mg) was added and stirred overnight. After completion, the reactionmixture was neutralized with AMBERLITE resin IR-120 (H+ form) and filtered. Thesolvent was evaporated and dried in high vacuum. The crude tetraol was stirred inpyridine at 0 C to which BzCl was added drop-wise followed by a catalytic amount ofDMAP. The reaction mixture was stirred overnight and concentrated in rota-evaporator.Further, the crude residue was diluted with H2O and extracted with EtOAc (3 ¡Á 20 mL).The combined organic layers were washed with 0.1 N HCl solution followed by brineand dried over anhydrous Na2SO4. Finally, the organic layer was concentrated andpurified by column chromatography (hexane:EtOAc) to obtain the title compounds in>75% yield over two steps., 28244-94-2

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Reference£º
Article; Singh, Adesh Kumar; Tiwari, Varsha; Mishra, Kunj Bihari; Gupta, Surabhi; Kandasamy, Jeyakumar; Beilstein Journal of Organic Chemistry; vol. 13; (2017); p. 1139 – 1144;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

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The synthetic route of 28244-94-2 has been constantly updated, and we look forward to future research findings.

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.28244-94-2,4-Methylphenyl 2,3,4,6-tetra-O-acetyl-1-thio-¦Â-D-glucopyranoside,as a common compound, the synthetic route is as follows.

General procedure: Oxidation condition a: thioglycoside substrate (0.40 mmol) and phenol (10 eq, 376 mg) were mixed to form a syrup state solution. H2O2 (2 eq, 82 muL, 30%) was added into the reaction solution, and the flask was heated to 60 C. The reaction solution was maintained at 60 C for 3 hours until all thioglycoside was transformed into glycosyl sulfoxide. The reaction solution was diluted with dichloromethane (20 ml), then was washed with dilute NaOH solution (5%, 10 ml) and water. The organic phase was dried with anhydrous Na2SO4. The corresponding glycosyl sulfoxide was separated by column chromatography. Oxidation condition b: thioglycoside substrate (0.40 mmol) and phenol (2 eq, 75 mg) were dissolved in AcOH (2 ml), H2O2 (2 eq, 82 muL, 30%) was added into the solution. The reaction was maintained at room temperature for 24 hours until all thioglycoside was transformed into glycosyl sulfoxide. The reaction solution was diluted with dichloromethane (20 ml), then was washed with dilute water and saturated NaHCO3 solution. The organic phase was dried with anhydrous Na2SO4. The corresponding glycosyl sulfoxide was separated by column chromatography., 28244-94-2

The synthetic route of 28244-94-2 has been constantly updated, and we look forward to future research findings.

Reference£º
Article; Wang, Qing; Wei, Xiong; Liao, Kaijun; Li, Hui; Meng, Xiangbao; Li, Zhongjun; Tetrahedron Letters; vol. 57; 21; (2016); p. 2277 – 2279;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics

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28244-94-2 4-Methylphenyl 2,3,4,6-tetra-O-acetyl-1-thio-¦Â-D-glucopyranoside 10411640, aTetrahydropyrans compound, is more and more widely used in various fields.

28244-94-2, 4-Methylphenyl 2,3,4,6-tetra-O-acetyl-1-thio-¦Â-D-glucopyranoside is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Dichloromethane (600 ml) was added to the reaction flask containing D-2 (380 g). Methanol (2100 ml) was added and cooled with ice bath, then sodium methoxide (MeOMe) (9.04 g) was added. After the addition, the solution was heated to 30 C. and stirred for 2 hr until completion check by TLC (MeOH/DCM=1/7). Amberlite IR120 ion exchange resin (160 g) was recovered by suction filtration and washed with Dichloromethane (100 ml). The mixture was concentrated under vacuum, the viscous oily liquid, D-3 (235.5 g) was obtained., 28244-94-2

28244-94-2 4-Methylphenyl 2,3,4,6-tetra-O-acetyl-1-thio-¦Â-D-glucopyranoside 10411640, aTetrahydropyrans compound, is more and more widely used in various fields.

Reference£º
Patent; FORMOSA LABORATORIES, INC.; Liu, Yu-Liang; Wei, Ching-Peng; (67 pag.)US2017/15695; (2017); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics