<i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetraalkyl-2,2′-dihydroxy-1,1′-binaphthyl-3,3′-dicarboxamides: Novel Chiral Auxiliaries for Asymmetric Simmons–Smith Cyclopropanation of Allylic Alcohols and for Asymmetric Diethylzinc Addition to Aldehydes
作者:Hiroshi Kitajima、Katsuji Ito、Yuko Aoki、Tsutomu Katsuki
DOI:10.1246/bcsj.70.207
日期:1997.1
efficient chiral auxiliaries for the asymmetric Simmons–Smith cyclopropanation of allylic alcohols and for asymmetric addition of diethylzinc to aldehydes. For example, Simmons-Smith cyclopropanation of cinnamyl alcohol in the presence of N,N,N′,N′-tetraethyl-2,2′-dihydroxy-1,1′-binaphthyl-3,3′-dicarboxamide (1b) proceeded with high enantioselectivity of 94% ee and addition of diethylzinc to benzaldehyde
发现新引入的标题化合物是烯丙醇的不对称 Simmons-Smith 环丙烷化和二乙基锌与醛的不对称加成的有效手性助剂。例如,在 N,N,N',N'-tetraethyl-2,2'-dihydroxy-1,1'-binaphthyl-3,3'-dicarboxamide (1b) 存在下肉桂醇的 Simmons-Smith 环丙烷化反应进行在 N,N,N',N'-四异丙基-2,2'-二羟基-1,1'-联萘-3,3'-二甲酰胺存在下,具有 94% ee 的高对映选择性和二乙基锌与苯甲醛的加成( 1e) 以 99% ee 的对映选择性进行。尽管这些反应的反应机理仍然是核反应,但单体七元 2,2'-二羟基-1,1'-联萘-3,3'-二甲酰胺 (1)-Zn 复合物被认为是一种活性物质,催化上述反应,