Facile synthesis of heteroaryl substituted $\gamma$-lactams from nitrovinyl arenes
作者:Seda ÇINAR、Canan ÜNALEROĞLU
DOI:10.3906/kim-1705-25
日期:——
Aliphatic nitroalkanes with different functional groups were synthesized from the Michael addition reactions of active methylene compounds 2 and nitrovinyl arenes 1 in high yields. The synthesized Michael adducts were subjected to intramolecular cyclization to give heteroaryl substituted γ-lactams in good to high yields under mild reaction conditions.
progress has been made toward the development of metal-free catalysts of enantioselective transformations, yet the discovery of organic catalysts effective at low catalyst loadings remains a major challenge. Here we report a novel synergistic catalyst combination system consisting of a peptide-inspired chiral helical (thio)urea oligomer and a simple tertiary amine that is able to promote the Michael reaction
Process for preparing optically active nitro compounds and cyano compounds
申请人:Kanto Kagaku Kabushiki Kaisha
公开号:EP1512678A1
公开(公告)日:2005-03-09
[Problem] The problem of the invention is to prepare nitro compounds and cyano compounds in high efficiency and high stereoselectivity by a simple and practical Michael reaction.
[Solution] A process for preparing optically active nitro compounds and cyano compounds representedbythechemical formula (C) using a metal complex, which is obtained by reaction of an optically active nitrogen-containing compound and a periodic table group VIII metal complex, in the asymmetric Michael reaction of a compound represented by the chemical formula (A) and a compound represented by the chemical formula (B) according to the claim 1.
The study of reaction mechanism for the transformation of nitronate into nitrile by phosphorus trichloride
作者:Zhijay Tu、Yaochung Jang、Chunchi Lin、Ju-Tsung Liu、Jianming Hsu、M.N.V. Sastry、Ching-Fa Yao
DOI:10.1016/j.tet.2005.08.041
日期:2005.10
investigated under different conditions. With different anions of malonates containing dipolarphiles, cyclic compounds were obtained as major products indicating nitrile oxides were generated during the reaction. Based on the results, compared to that of the one reported in literature, a plausible mechanism involving nitrile oxide intermediate was proposed.
1,5,7-Triazabicyclo[4.4.0]dec-5-ene (TBD) catalyzed Michael reactions
作者:Weiping Ye、Junye Xu、Chin-Tong Tan、Choon-Hong Tan
DOI:10.1016/j.tetlet.2005.08.010
日期:2005.10
1,5,7-Triazabicyclo[4.4.0]dec-5-ene (TBD), a bicyclic guanidine base, has been found to be an excellent catalyst for Michael and Michael-type reactions. A wide variety of Michael donors and acceptors can participate in these reactions using 10-20 mol% of TDB. These reactions are mild, fast, easy to perform, produce excellent yields and can occur in several solvents without the need for strictly anhydrous conditions. (c) 2005 Elsevier Ltd. All rights reserved.