The development of highly active acyclic chiral hydrazides for asymmetric iminium ion organocatalysis
作者:Eoin Gould、Tomas Lebl、Alexandra M. Z. Slawin、Mark Reid、Tony Davies、Andrew D. Smith
DOI:10.1039/c3ob41719k
日期:——
Double asymmetric induction has been employed as a tool to optimise pyrazolidinone-derived organocatalysts for the asymmetric iminium ion catalysed Diels–Alder reaction. Mechanistic studies revealed a superior hydrazide catalyst deriving from methanolysis of the chiral pyrazolidinone precursor. This catalyst displays unusually high endo diastereoselectivity and good enantioselectivity with a range
双不对称感应已被用作优化吡唑烷酮衍生的有机催化剂用于不对称亚胺离子催化的Diels-Alder反应的工具。机理研究表明,一种优异的酰肼催化剂是由手性吡唑烷酮前体的甲醇分解反应而得。该催化剂在低至1 mol%的催化剂负载下显示出异常高的内非对映选择性和良好的对映选择性,以及一系列β-芳烃和环状二烯。