5-O-tert-butyldimethylsilyl-4''-epi-avermectin B1b trifluoromethanesulfonate 、 5-O-tert-butyldimethylsilyl-4''-epi-avermectin B1a trifluoromethanesulfonate 、
氰化四丁基铵 以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 6.0h,
生成
5-O-tert-butyldimethylsilyl-4''-deoxy-4''-(S)-cyanoavermectin B1b 、 5-O-tert-butyldimethylsilyl-4''-deoxy-4''-(S)-cyanoavermectin B1a