5-O-tert-butyldimethylsilyl-4''-epi-avermectin B1b trifluoromethanesulfonate 、 5-O-tert-butyldimethylsilyl-4''-epi-avermectin B1a trifluoromethanesulfonate 在
potassium iodide 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 2.0h,
生成 5-O-tert-butyldimethylsilyl-4''-deoxy-4''-(S)-iodoavermectin B
1b 、 5-O-tert-butyldimethylsilyl-4''-deoxy-4''-(S)-iodoavermectin B
1a