indoline-(thio)urea were designed and prepared using indoline(s) as a new platform and tested as organocatalysts in the Michael and Morita–Baylis–Hillman reactions. Most of the compounds were found to be very active catalysts although they did not promote the enantioselectivity. As agents for the conversion of thiocarbonylcompounds into carbonyl compounds, potentials of PIFA and DDQ were also displayed
摘要 以二氢吲哚为新平台,设计并制备了一系列新型二氢吲哚-(硫)脲,并作为有机催化剂在 Michael 和 Morita-Baylis-Hillman 反应中进行了测试。大多数化合物被发现是非常活跃的催化剂,尽管它们没有提高对映选择性。作为将硫代羰基化合物转化为羰基化合物的试剂,PIFA 和 DDQ 的潜力也得到了展示。此外,DFT 计算使实验观察到的催化剂的非对映选择性合理化。图形概要
A highly efficient kinetic resolution of Morita–Baylis–Hillman adducts achieved by N–Ar axially chiral Pd-complexes catalyzed asymmetric allylation
作者:Feijun Wang、Shengke Li、Mingliang Qu、Mei-Xin Zhao、Lian-Jun Liu、Min Shi
DOI:10.1039/c1cc15543a
日期:——
Palladium complexes with an axially chiral NâAr framework have been developed. These complexes showed high stereoselectivities in asymmetric allylic arylation to achieve the kinetic resolution of MoritaâBaylisâHillman adducts, affording up to 99% ee of (E)-allylation products and 92% ee of recovered MoritaâBaylisâHillman adducts.
Chemoenzymatic and bienzymaticcascades: We herein present three cascade routes to produce MBH adducts and compare the key advantages and challenges of the chemoenzymatic and bienzymatic methodologies.
Asymmetric Morita–Baylis–Hillman reactions of 2-cyclohexen-1-one catalyzed by chiral biaryl-based bis(thiourea) organocatalysts
作者:Yuki Nakayama、Takashi Gotanda、Katsuji Ito
DOI:10.1016/j.tetlet.2011.09.064
日期:2011.11
Newly-developed bis(thiourea) 1d was found to be an efficient organocatalyst for the Morita-Baylis-Hillman reaction. High enantioselectivities were obtained in the reaction of 2-cyclohexen-1-one with both aromatic aldehydes (up to 84% ee) and aliphatic aldehydes (up to 96% ee). (C) 2011 Elsevier Ltd. All rights reserved.