Construction of Tricyclic Enone, a Common Precursor for Aphidicolane and Stemodane B/C/D-Ring System
作者:Tetsuaki Tanaka、Sachiko Yamamoto、Kei Hiramatsu、Kazuo Murakami、Hitoshi Yoshino、Debasis Patra、Chuzo Iwata、Hiroaki Ohno
DOI:10.1248/cpb.54.1138
日期:——
Synthesis of a tricyclic enone (B/C/D ring system), a common key precursor for the aphidicolane- and stemodane-type diterpene, is described. The key reaction for the construction of the quaternary carbon center is allylation of epoxide at the more substituted carbon with an organotitanium reagent. Asymmetric reduction with DIP-Cl followed by stereoselective cyclization of spirocyclic ketone and the
描述了三环烯酮(B / C / D环系统)的合成,B / C / D环系统是蚜虫环型和蛇毒烷型二萜的常见关键前体。构筑季碳中心的关键反应是用有机钛试剂将更多取代的碳上的环氧化物烯丙基化。用DIP-Cl不对称还原,然后对螺环酮进行立体选择性环化和官能团修饰,以良好的收率得到了所需的三环烯酮。