Synthesis ofcis andtrans Whisky and Cognac lactones by the regiocontrolled alkylation of 2-(trimethylsiloxy)furan
作者:Charles W. Jefford、Adam W. Sledeski、John Boukouvalas
DOI:10.1002/hlca.19890720625
日期:1989.9.20
The racemic cis- and trans-5-butyltetrahydro-4-methylfuran-2-ones ( = whisky lactones) and their higher homologues tetrahydro-4-methyl-5-pentylfuran-2-ones ( = cognac lactones) have been prepared in 2–3 steps from 2-(trimethylsiloxy)furan. Regioselective alkylation of the latter afforded the 5-butyl- and 5-pentylfuran-2(5H)-ones which served as precursors for the stereocontrolled construction of either
外消旋的顺式和反式-5-丁基四氢-4-甲基呋喃-2-酮(=威士忌内酯)及其高级同系物四氢-4-甲基-5-戊基呋喃-2-酮(=白兰地内酯)已在2中制备。从2-(三甲基甲硅烷氧基)呋喃中–3步。后者的区域选择性烷基化提供了5-丁基-和5-戊基呋喃-2(5 H)-一,它们用作饮料内酯的任一非对映异构体的立体控制结构的前体。还描述了这些5-烷基呋喃-2(5H)-一的重氮甲烷加合物的结构和互变异构。