Asymmetric Aza-MoritaBaylisHillman Reaction ofN-Sulfonated Imines with Methyl Vinyl Ketone Catalyzed by Chiral Phosphine Lewis Bases Bearing Perfluoroalkanes as “Pony Tails”
作者:Min Shi、Lian-Hui Chen、Wen-Dong Teng
DOI:10.1002/adsc.200505123
日期:2005.11
In the aza-Morita–BaylisHillman reaction of N-sulfonated imines (N-arylmethylidene-4-methylbenzenesulfonamides and others) with methyl vinyl ketone (MVK), we found that in the presence of a catalytic amount of the chiral phosphine Lewis bases (R)-(−)-6,6′-bis[tris(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)silyl]-2′-(diphenylphosphanyl)-[1,1′]binaphthalenyl-2-ol LB2 and (R)-(−)-6,6′-(3,3,4,4,5, 5
在的氮杂森田-BaylisHillman反应Ñ -sulfonated亚胺(Ñ用甲基乙烯基酮(MVK)-arylmethylidene -4- methylbenzenesulfonamides等),我们发现,在手性膦路易斯碱催化量存在(ř)-(-)-6,6'-双[三(3,3,4,4,5,5,6,6,7,7,8,8,8,8-三氟氟辛基)甲硅烷基] -2'-(二苯基膦基)-[1,1']联萘-2-醇LB2和(R)-(-)-6,6'-(3,3,4,4,5,5,6,6,7,7, 8,8,8-三氟氟辛基)-2'-(二苯基膦基)-[1,1']联萘-2-醇LB3在萘骨架的6,6'-位带有两个全氟烷烃链,可以在室温(15°C)或低温(-分别在THF中(20°C)。LB3在该反应中比先前报道的原始手性膦路易斯碱(R)-(-)-2'-二苯基膦基-[1,1']二萘基-2-醇LB1更有效。