Cascade Cope/Winstein Rearrangements: Synthesis of Azido-Cycloheptadienes from Dialkenylcyclopropanes Possessing a Vinyl Azide
作者:Thomas Abegg、Janine Cossy、Christophe Meyer
DOI:10.1021/acs.orglett.2c01888
日期:2022.7.15
2-Dialkenylcyclopropanes incorporating a vinyl azide, generated by Knoevenagel condensations between the corresponding cyclopropanecarbaldehydes and α-azido ketones, undergo cascade Cope and Winstein [3,3]-sigmatropic rearrangements, under mild conditions. The sequence allows access to diversely substituted 1,4-cycloheptadienes armed with a secondary allylic azide with up to three stereocenters.
顺式-1,2-二烯基环丙烷包含乙烯基叠氮化物,由相应的环丙烷甲醛和 α-叠氮基酮之间的 Knoevenagel 缩合产生,在温和条件下发生级联 Cope 和 Winstein [3,3]-σ 重排。该序列允许使用具有多达三个立体中心的二级烯丙基叠氮化物的多种取代的 1,4-环庚二烯。