作者:Kazushi Watanabe、Yuto Suzuki、Kenta Aoki、Akira Sakakura、Kiyotake Suenaga、Hideo Kigoshi
DOI:10.1021/jo048833l
日期:2004.11.1
strained carbon skeletons by ring-closing olefin metathesis (RCM) was investigated. With well-designed diene 4, RCM was found to be applicable to the formation of a highly strained inside−outside bicyclo[4.4.1]undecane skeleton of ingenol, a bioactive diterpenoid, and formal total synthesis of optically active ingenol (1) was achieved. The key features of this synthesis are construction of an A-ring
研究了通过闭环烯烃复分解(RCM)构建应变碳骨架的方法。通过精心设计的二烯4,发现RCM适用于形成高张力的丁香酚内-外双环[4.4.1]十一烷骨架,生物活性二萜类化合物,并正式合成了旋光性香茅酚(1)。实现。该合成的关键特征是通过用烯丙基氯化物单元26对酮进行螺环化来构建A环,以及通过烯烃复分解实现B环的闭环。从Funk的酮酸酯6开始,关键的中间体醛9在Winkler的总合成物中,八步合成的总收率为12.5%。这种直接应变的内部-外部骨架环化的策略为光学活性丁二酚提供了第一个简便的途径。