Asymmetric Platinum Group Metal-Catalyzed Carbonyl-Ene Reactions: Carbon−Carbon Bond Formation versus Isomerization
作者:Simon Doherty、Julian G. Knight、Catherine H. Smyth、Ross W. Harrington、William Clegg
DOI:10.1021/jo062023n
日期:2006.12.1
comparative study of the carbonyl-ene reaction between a range of 1,1‘-disubstituted or trisubstituted alkenes and ethyl trifluoropyruvate catalyzed by Lewis acid−platinum group metal complexes of the type [M(R)-BINAP}]2+ (M = Pt, Pd, Ni; BINAP is 2,2‘-bis(diphenylphosphino)-1,1‘-binaphthyl) revealed subtle but significant differences in their reactivity. For instance, the palladium-based Lewis acid [Pd(R)-BINAP}]2+
之间的范围内的羰基-烯反应的比较研究1,1'-二取代或三取代烯烃和乙基三氟丙酮催化由类型的路易斯酸-铂族金属配合物[M ([R)-BINAP}] 2+( M = Pt,Pd,Ni; BINAP为2,2′-双(二苯基膦基)-1,1′-联萘基)显示出微妙但显着的反应性差异。例如,基于钯的路易斯酸[Pd (R)-BINAP}] 2+催化亚甲基环烷烃之间的烯反应,从而以良好的收率和优异的非对映和对映选择性提供了预期的α-羟基酯。相反,在相同条件下,相应的[M (R)-BINAP}] 2+(M = Pt,Ni)催化亚甲基环烷烃的异构化以及亚甲基环烷烃和1-甲基环烯烃的混合物以相似的速率进行烯反应,从而以高区域选择性,良好的非对映选择性和优异的优异性能提供了一系列的α-羟基酯。对映选择性。此外,[Pt (R)-BINAP}] 2+它还催化烯产物的后反应异构化以及连续的烯反应,得到双羰基烯产物。