Ketal-lactone compounds and their stereoselective cleavage to cyclic ethers
作者:Jong-Gab Jun、Dong Woo Lee
DOI:10.1016/s0040-4039(97)10196-4
日期:1997.11
The easy preparation of ketal-lactone compounds via Diels-Alder reaction, followed by hydrolysis and cyclization and excellent stereoselective ring opening of the ketal-lactone to 6-membered and 7-membered cyclic ethers are described.
Diastereoselective Construction of 2,2,6-Trisubstituted Tetrahydropyrans by Intramolecular Alkylation Reaction of Lithium Enolates Generated from α-Alkoxy Carboxylates
The intramolecular alkylation reaction of enolates of t-butyl α-alkoxy carboxylates in THF–HMPA proceeded stereoselectively to afford 2,2,6-trisubstituted tetrahydropyrans with high cis-selectivity.