Dominicalure 1 (9a) and dominicalure 2 (9b), were synthesized by esterification of alpha,beta-unsaturated acids4a and4b with (S)-(+)-2-pentanol (8). The key step was the asymmetric reduction of 3-penten-2-one (5) to give the chiral intermediate6, which, upon diimide reduction, DNB derivatization, recrystallization, and hydrolysis, yielded8 in 63% ee. Acids4a and4b were prepared in a simple and efficient
Dominicalure 1 (9a) 和 dominicalure 2 (9b) 是通过 α,β-不饱和酸 4a 和 4b 与
(S)-(+)-2-戊醇 (8) 酯化合成的。关键步骤是 3-penten-2-one (5) 的不对称还原得到手性中间体 6,在二
酰亚胺还原、DNB 衍生化、重结晶和
水解后,得到 63% ee 的 8。酸 4a 和 4b 以简单有效的三步合成法制备,总收率分别为 54% 和 62%,呈立体异构纯形式。