反应详情

1-(3,4,5-trimethoxyphenyl)-1,2-ethanedithiol (39) (FIG. 19) (0.689 g,2.65 mmole), 3-methoxy-5-nitro-4-propoxybenzaldehyde (40) (0.633 g, 2.65 mmole) and 0.266 g of pyridinium para-toluenesulfonate was added to 50 ml dry benzene and refluxed with Dean-Stark removal of the benzene- water azeotrope for 24 hours. The benzene was removed in vacuo, and the remaining oil redissolved in dichloromethane and was purified by flash column chromatography with 9:1 hex/ethyl acetate as eluent. The product mixture contains a 1/1 cis/trans ratio (0.600 g, 47%).

1. customThe benzene was removed in vacuo
2. dissolutionthe remaining oil redissolved in dichloromethane
3. customwas purified by flash column chromatography with 9:1 hex/ethyl acetate as eluent