a set of hydroxyphenyl γ-valerolactones was achieved starting from 2-silyloxyfuran and alkoxy-substituted benzaldehydes as common precursors. Key synthesis steps included an enantioselective vinylogous Mukaiyama aldol reaction and a Barton–McCombie deoxygenation. Five enantioenriched γ-valerolactone targets were obtained in 5–6 steps, 18–63% overall yields and 82–98 % ee, paving the way for the straightforward
从2-甲
硅烷氧基
呋喃和烷氧基取代的
苯甲醛作为常见的前体开始,实现了一组羟苯基
γ-戊内酯的不对称合成。关键的合成步骤包括对映选择性的
乙烯基Mukaiyama aldol反应和Barton-McCombie脱氧反应。通过5–6个步骤获得了5个对映体富集的
γ-戊内酯目标,总产率为18–63%,ee为82–98%,这为直接进入此类具有
生物有效性且难得的flavan -3-ol代谢物铺平了道路。同时,偶然发现了一种空前的一锅还原环扩展过程,从
酚丁醇化物前体产生外消旋的δ-
内酯类似物。