New Strategic Reactions for Organic Synthesis: Catalytic Asymmetric C−H Activation α to Nitrogen as a Surrogate for the Mannich Reaction
作者:Huw M. L. Davies、Chandrasekar Venkataramani、Tore Hansen、Darrin W. Hopper
DOI:10.1021/ja0290072
日期:2003.5.1
activation reactions of methyl aryldiazoacetates are readily induced by the rhodium prolinate catalyst Rh(2)(S-DOSP)(4) (1) or the bridged prolinate catalysts Rh(2)(S-biDOSP)(2) (2a) and Rh(2)(S-biTISP)(2) (2b). The C-H activation of N-Boc-protected cyclic amines demonstrates that the donor/acceptor-substituted carbenoids display remarkable chemoselectivity, which allows for highly regioselective,
重氮乙酸甲酯的不对称 CH 活化反应很容易被脯氨酸铑催化剂 Rh(2)(S-DOSP)(4) (1) 或桥连脯氨酸催化剂 Rh(2)(S-biDOSP)(2) (2a) 诱导) 和 Rh(2)(S-biTISP)(2) (2b)。N-Boc 保护的环胺的 CH 活化表明供体/受体取代的类卡宾显示出显着的化学选择性,可以实现高度区域选择性、非对映选择性和对映选择性反应。此外,这些反应可以显示出高水平的双立体分化和动力学分辨率。CH 活化是由铑卡宾诱导的 CH 插入引起的。这种化学反应的潜力可以通过非常直接地合成哌醋甲酯来证明。