B by RCM, which is the key step in the synthesis of the pine-resin sesquiterpene 1,6-germacradien-5-ol, was improved by protecting the hydroxy group of the precursor bisolefin A as a bulky tert-butyldimethylsilyl ether and by complexing its carbonyl group with Ti(OiPr)4 .
通过闭环复分解(RCM)甚至可以获得10元环。通过保护前体双烯烃A的羟基作为大体积的叔丁基二甲基甲
硅烷基,可以改进RCM合成碳环B的过程,这是松树
倍半萜烯1,6-germacradien-5-ol合成的关键步骤。醚并将其羰基与Ti(OiPr)4络合。