Cycloaddition reaction of 2-vinylpyrrolidines with carbodiimides in the presence of palladium acetate and dpppentane affords seven-membered ring cyclic arylguanidines in good yields and conversions. When 1-butyl-4-methyl-2-vinylpyrrolidine 1c was used as a mixture of trans and cis isomers in a 4:1 ratio, and reacted with bis(2-chlorophenyl)carbodiimide 2a, high stereoselectivity was achieved and only
2-
乙烯基吡咯烷与碳二
亚胺在
乙酸钯和dpppentane的存在下进行环加成反应,可提供良好的收率和转化率的七元环芳基
胍。当1-丁基-4-甲基-2-
乙烯基吡咯1C用作的混合物反式和CIS的4种异构体:1的比例,并与双(2-
氯苯基)碳二
亚胺反应2a中,高立体选择性达到并且仅反得到七元环状
胍。
吡咯烷环的4-位上的甲基和碳二
亚胺的邻位上的
氯取代基可能是有利于反式异构体的产物比率提高的原因。