versatile chiral building block. The strategy is based on three key transformations: enantioselective hetero-Diels−Alder (HDA) reaction of aldehyde with Danishefsky’s diene, selective reduction of carbonyl function, and Claisen or related rearrangement. The synthetic utility of the methodology is illustrated by total synthesis of antibiotic (−)-centolobine.
本文提出了一种简单有效的方法,以手性顺式-6取代的2-(2-羟乙基)-5,6-二氢-2 H-
吡喃,一种通用的手性构建基。该策略基于三个关键转换:醛与
DAnishefsky的二烯的对映选择性杂Diels-Alder(H
DA)反应,羰基官能团的选择性还原以及克莱森(Claisen)或相关的重排。该方法的合成效用通过抗生素(-)-centolobine的全合成得到了说明。