[RuCl2(CO)3]2/Et3N and (eta 3-C3H5)RuBr(CO)3/Et3N are highly effective catalyst systems for carbonylative cyclization of allylic carbonates with alkenes to give the corresponding cyclopentenones in high yields. For example, treatment of allyl methyl carbonate (1a) with 2-norbornene (2a) in the presence of a catalytic amount of [RuCl2(CO)3]2 (2.5 mol %) and Et3N (10 mol %) at 120 degrees C for 5 h under
[RuCl2(CO)3] 2 / Et3N和(η3-
C3H5)RuBr(CO)3 / Et3N是高效的催化剂体系,用于烯
丙基碳酸酯与烯烃的羰基环化,以高收率得到相应的
环戊烯。例如,在120℃下在催化量的[RuCl2(CO)3] 2(2.5 mol%)和Et3N(10 mol%)的存在下用2-
降冰片烯(2a)处理
碳酸烯丙基甲酯(1a)在3个大气压的
一氧化碳下保持5小时,得到相应的
环戊烯酮,exo-4-methyltricyclo [5.2.1.0(2,6)] dec-4-en-3-one(3a),产率为80%,立体选择性高( exo 100%)。