Direct Asymmetric Allylic Alkenylation of <i>N</i>-Itaconimides with Morita–Baylis–Hillman Carbonates
作者:Wenguo Yang、Davin Tan、Lixin Li、Zhiqiang Han、Lin Yan、Kuo-Wei Huang、Choon-Hong Tan、Zhiyong Jiang
DOI:10.1021/jo3012539
日期:2012.8.3
asymmetric allylic alkenylation of Morita–Baylis–Hillman (MBH) carbonates with N-itaconimides as nucleophiles has been developed using a commercially available Cinchona alkaloid catalyst. A variety of multifunctional chiral α-methylene-β-maleimide esters were attained in moderate to excellent yields (up to 99%) and good to excellent enantioselectivities (up to 91% ee). The origin of the regio- and stereoselectivity
使用市售的金鸡纳生物碱催化剂,已经开发出以N- itaconimides作为亲核试剂的Morita-Baylis-Hillman(MBH)碳酸酯的不对称烯丙基烯基化反应。以中等至优异的产率(高达99%)和良好至优异的对映选择性(高达91%ee)获得了多种多功能手性α-亚甲基-β-马来酰亚胺酯。区域选择性和立体选择性的起源已通过DFT方法进行了验证。计算得到的各种过渡态的几何形状和相对能量,有力地支持了所观察到的区域和对映选择性。