5-O-tert-butyldimethylsilyl-4''-deoxy-4''-(S)-allylavermectin B1b 、 5-O-tert-butyldimethylsilyl-4''-deoxy-4''-(S)-allylavermectin B1a 在
[1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene]dichloro(phenylmethylene)(tricyclohexylphosphine)ruthenium 作用下,
以
二氯甲烷 为溶剂,
生成
5-O-tert-butyldimethylsilyl-4''-deoxy-4''-(S)-(1-methylvinyl)avermectin B1b 、 5-O-tert-butyldimethylsilyl-4''-deoxy-4''-(S)-(1-methylvinyl)avermectin B1a