Synthesis of N-Styrenyl Amidines from α,β-Unsaturated Nitrones and Isocyanates through CO2 Elimination and Styrenyl Migration
摘要:
A mild, metal-free, and modular route for the preparation of N-styrenyl amidines from N-aryl-alpha,beta-unsaturated nitrones and isocyanates has been developed that accesses an initial oxadiazolidinone intermediate that can undergo CO2 elimination and styrenyl migration. The use of a migration event to install N-styrenyl amidine substituents circumvents a limitation of traditional Pinner-type methods for amidine synthesis that require the use of amine nucleophiles. The modularity of the nitrone and isocyanate reagents provides access to a variety of differentially substituted N-styrenyl amidines. The scope and tolerance of the method are presented, and preliminary mechanistic data for the transformation are discussed.
Asymmetric Double Michael Reaction Catalyzed by Simple Primary Amine Catalysts: A Straightforward Approach to Construct Spirocyclic Oxindoles
作者:Xiya Luo、Liangliang Wang、Lin Peng、Jianfei Bai、Lina Jia、Guangyun He、Fang Tian、Xiaoying Xu、Lixin Wang
DOI:10.1002/cjoc.201100543
日期:2012.5
The enantioselective doubleMichaelreaction of N‐Boc‐3‐nonsubstitued oxindoles with dienones catalyzed by chiral monoimide protected cyclohexane‐1,2‐diamines was developed. A wide range of optically active spirocyclic oxindoles were obtained up to 98% yield and up to 89% ee.
COMPOUNDS USEFUL AGAINST KINETOPLASTIDEAE PARASITES
申请人:Davioud-Charvet Elisabeth
公开号:US20120214996A1
公开(公告)日:2012-08-23
Dibenzylidene and heterobenzylideneacetone derivatives, related 4-piperidones, related 4-thiopyranones and the corresponding sulfinyl- and sulfonyl-analogues for their use for prophylaxis or treatment of trypanosomiasis and leishmaniasis.