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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.693287-79-5,tert-Butyl 2-(tetrahydro-2H-pyran-4-yl)hydrazinecarboxylate,as a common compound, the synthetic route is as follows.,693287-79-5

Step 3: Intermediate 43-d [0232] To a solution of intermediate 43-c (32.4 g, 150 mmol) in MeOH (300 mL) was added 4N HCl in 1,4-dioxane (300 ml, 1200 mmol) and the reaction was stirred at room temperature for 5 hours. Diethyl ether was added and a precipitate formed which was collected by filtration to provide intermediate 43-d.HCl as a white solid.

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Reference£º
Patent; Pharmascience, Inc.; Laurent, Alain; Rose, Yannick; Jaquith, James B.; US2015/191473; (2015); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics