The cycloaddition of enamines with electrophilic gem-dimethylcyclopropenes followed by solvolytic ring cleavage of the 2-amino bicyclo [2.1.0] pentane adducts, leads to gem-dimethylcyclopentene derivatives. These reactions are used as key-sequence for the synthesis of Hirsutene, a natural linear triquinane, starting from the cyanocyclopropene 18 and the diquinane enamine 15. The cis-anti-cis-anti-cis
烯胺与亲电的宝石-二甲基环
丙烯的环加成,然后2-
氨基
双环[2.1.0]戊烷加合物的溶剂化环裂解,生成宝石-二甲基
环戊烯衍
生物。这些反应用作从
氰基环
丙烯18和二喹烷烯胺15开始合成天然线性三喹烷Hi烷的关键序列。通过X射线晶体学测定证实了包含
双环[2.1.0]戊烷亚结构的中间四环加合物20b的顺-抗-顺-抗-顺结构。