Substituted Alkenediols by Alkylative Double Ring Opening of Dihydrofuran and Dihydropyran Epoxides
作者:David M. Hodgson、Matthew A. H. Stent、Francis X. Wilson
DOI:10.1021/ol016638c
日期:2001.10.1
[reaction: see text]. Dihydrofuran and dihydropyran epoxides undergo alkylative double ring opening with organolithiums to provide a new route to substituted alkenediols.
A process for preparing a substituted alkene diol, of the formula (I) wherein n is 0 to 4, R is an unsubstituted or substituted aliphatic or aromatic radical, R1 is hydrogen or an aliphatic or aromatic radical and each of R?2, R3, R4 and R5¿ which are the same or different, is hydrogen or an unsubstituted or substituted aliphatic or aromatic radical, or R?2 and R3¿ together form a divalent radical having 1 to 4 chain carbon atoms which comprises reacting an epoxide of the formula (II) wherein n, R?1, R2, R3, R4 and R5¿ are as defined above with an organolithium compound of the formula: RLi wherein R is as defined above is described. Some of the starting materials and final products are novel.