Brønsted acidscatalyze the addition of β-enaminoacrylates to α,β-unsaturated aldehydes leading to substituted dihydropyridines in moderate to good yields under mild conditions. The first example of an enantioselective synthesis of a dihydropyridine is also reported.
Iron‐Catalyzed Synthesis of Substituted Thiazoles from Enamines and Elemental Sulfur through C−S Bond Formation
作者:Mingzhong Wu、Yong Jiang、Zhenyu An、Zhenjie Qi、Rulong Yan
DOI:10.1002/adsc.201800693
日期:2018.11.5
An atom economical approach for the synthesis of substituted thiazoles starting from enamines and elementalsulfur through the C−H functionalization/C−S bond formation is described. Under the optimized conditions, various substituted enamines reacted smoothly with elementalsulfur and the desired substituted thiazoles were generated in moderate to excellent yields.
Chiral Lewis Base Catalyzed Highly Enantioselective Reduction of N-Alkyl β-Enamino Esters with Trichlorosilane and Water
作者:Xinjun Wu、Yang Li、Chao Wang、Li Zhou、Xiaoxia Lu、Jian Sun
DOI:10.1002/chem.201003105
日期:2011.3.1
of a chiral Lewisbase catalyst 2, the supposedly moisture‐unfriendly reduction system with trichlorosilane was found to be highly efficient and enantioselective when using water as an additive. For the first time, this method enables the reduction of a broad range of N‐alkyl β‐enamino esters 1 to give N‐alkyl β‐amino esters 3 in good to high yields and with excellent enantioselectivities (see scheme)
Zn(ClO 4 ) 2 .6H 2 O proved to be a very powerfulcatalyst for the condensation of primary and secondary amines with β-ketoesters to give N-substituted β-enaminoesters.
Regio- and stereoselective double alkylation of β-enamino esters with organolithium reagents followed by one-pot reduction: convenient method for the synthesis of tertiary γ-amino alcohols
stereoselective procedure for the preparation of tertiary γ-amino alcohols starting from β-enamino esters is presented. In this procedure, the double alkylation of β-enamino esters with organolithium reagents is followed by one-pot reduction with sodium borohydride in methanol/acetic acid. A hypothesis of mechanism is given, explaining the observed diastereoselectivity through molecular modeling. The configuration
提出了一种简单,高产且立体选择性的方法,该方法可从β-烯胺酯开始制备叔γ-氨基醇。在该方法中,用有机锂试剂对β-烯胺酯进行双烷基化,然后用硼氢化钠在甲醇/乙酸中一锅还原。给出了机理的假设,通过分子建模解释了观察到的非对映选择性。产物的构型通过1 H NMR光谱结合构象分析确定。