followed by sensitized photolysis. The resulting bicyclo [2.1.0] pentan-2-ol derivative 8 was cleaved by reflux in acetic acid, giving the diquinanes 9. The third five membered ring present in (±)-pentalenene was introduced via a silyl assisted Nazarov cyclization leading to the triquinane 3 which was transformed into (±)-pentalenene.
起始环戊
环丁烯4的
环丙烷化反应是通过使用
重氮乙烷进行1,3-偶极环加成反应,然后进行敏化光解而实现的。将所得的
双环[2.1.0]戊烷-2-醇衍
生物8在
乙酸中回流裂解,得到二喹烷9。通过甲
硅烷基辅助的Nazarov环化作用引入(±)-
戊烯中的第三个五元环,导致三喹烷3转化为(±)-
戊烯。