Ring‐Opening Cyclization of Spirocyclopropanes with Stabilized Phosphorus Ylides: Access to Indane and Azulene Skeletons
作者:Yuta Onuki、Koga Yamazaki、Yuto Masuda、Takayuki Yakura、Hisanori Nambu
DOI:10.1002/adsc.202300021
日期:——
In this study, regio- and diastereoselective ring-opening cyclization of spirocyclopropanes with phosphorus ylides stabilized by electron-withdrawing groups were developed. The reaction of various cyclohexane-1,3-dione-2-spirocyclopropanes with phosphorus ylides bearing alkoxycarbonyl groups proceeded smoothly without any additives to provide the corresponding 6,7-dihydroindan-4-ones in 32–87% yields
在这项研究中,开发了螺环丙烷与吸电子基团稳定的磷叶立德的区域和非对映选择性开环环化反应。各种环己烷-1,3-二酮-2-螺环丙烷与带有烷氧基羰基的磷叶立德的反应在没有任何添加剂的情况下顺利进行,以32-87%的产率提供相应的6,7-二氢茚满-4-酮。环庚烷-1,3-二酮-2-螺环丙烷也用于该反应,产生相应的产物1,2,3,6,7,8-六氢薁-4-酮,产率52-67%。所得的[5.6]-和[5.7]-稠合碳环产物很容易通过氧化分别转化为高度取代的茚满和甘菊环。