Phillips, Catherine published the artcileUseful route to 1,6-dioxaspiro[4.4]nonane and 1,6-dioxaspiro[4.5]decane derivatives, Related Products of tetrahydropyran, the publication is Journal of Organic Chemistry (1980), 45(10), 1920-4, database is CAplus.
A wide variety of 1,6-dioxaspiro[4.4]nonanes, e.g. I, and 1,6-dioxaspiro[4.5]decanes, e.g. II, including certain insect pheromones, can be conveniently prepared by reaction of the Li salts of protected alkynols with equimolar amounts of lactones followed by hydrogenation and acid-catalyzed deprotection and cyclization. Alkynols are satisfactorily protected either as their tetrahydropyranol or as their 1-ethoxyethyl ethers; intermediates need not be isolated. Yields are variable, but products are readily obtainable in high purity regardless of yield.
Journal of Organic Chemistry published new progress about 27943-46-0. 27943-46-0 belongs to tetrahydropyran, auxiliary class Tetrahydropyran,Alkynyl,Ether, name is 2-((2-Methylbut-3-yn-2-yl)oxy)tetrahydro-2H-pyran, and the molecular formula is C10H16O2, Related Products of tetrahydropyran.
Referemce:
https://en.wikipedia.org/wiki/Tetrahydropyran,
Tetrahydropyran – an overview | ScienceDirect Topics