已经提出了一种直接闭环策略,该策略涉及用于合成苯并 [ b ] 氮卓类化合物的o -炔基苯胺衍生物的不太容易进行 7-内切-挖掘碳环化。由于氮的高亲核性,在 o -炔基苯胺衍生物中的微不足道的 5-内切环化已被克服,通过在金催化下使用它们的插烯酰胺来获得广泛的苯并[ b ]]azepines 以原子经济的方式具有出色的官能团相容性。氘加扰实验和 DFT 研究支持一种机制,该机制涉及通过关键的环丙基金卡宾中间体稳定最初形成的七元乙烯基金中间体的构象变化及其随后由抗衡阴离子介导的原脱氧反应。
SN1-Type Reactions in the Presence of Water: Indium(III)-Promoted Highly Enantioselective Organocatalytic Propargylation of Aldehydes
作者:Riccardo Sinisi、Maria Victoria Vita、Andrea Gualandi、Enrico Emer、Pier Giorgio Cozzi
DOI:10.1002/chem.201100729
日期:2011.6.27
Water under troubled chemistry! The first catalytic stereoselective addition of aldehydes to internal functionalized propargylic alcohols promoted by a combination of organocatalysis and indium triflate is described (see scheme). The reaction is tolerant of functional groups (FG) and was performed in the presence of water. High enantioselectivities (anti, 92–99 % ee) and moderate diastereomeric ratios
Synthesis of Unsymmetrically Substituted 1,3-Butadiynes and 1,3,5-Hexatriynes via Alkylidene Carbenoid Rearrangements
作者:Annabelle L. K. Shi Shun、Erin T. Chernick、Sara Eisler、Rik R. Tykwinski
DOI:10.1021/jo026481h
日期:2003.2.1
Unsymmetrically substituted 1,3-butadiynes and 1,3,5-hexatriynes are synthesized in four steps from commercially available aldehydes or carboxylic acids. The key step in this process involves a Fritsch-Buttenberg-Wiechell rearrangement, in which an alkylidene carbenoid intermediate subsequently rearranges to the desired polyyne. This rearrangement proceeds under mild conditions, and it is tolerant
Direct and Stereoselective Alkylation of Nitro Derivatives with Activated Alcohols in Trifluoroethanol
作者:Diego Petruzziello、Andrea Gualandi、Stefano Grilli、Pier Giorgio Cozzi
DOI:10.1002/ejoc.201201345
日期:2012.12
benzylic, benzhydrylic, and propargylic alcohols in trifluoroethanol. A variety of different nitroalkanes bearing functional groups can be used in this SN1-typereaction to afford the desired products in quantitative yields. Different chiral nitro derivatives were submitted to this highly diastereoselective alkylation reaction with selected benzhydrols. A new, effective, and chiral pyrrolidine organocatalyst
A Rational Approach Towards a New Ferrocenyl Pyrrolidine for Stereoselective Enamine Catalysis
作者:Diego Petruzziello、Marco Stenta、Andrea Mazzanti、Pier Giorgio Cozzi
DOI:10.1002/chem.201300959
日期:2013.6.10
and pyrrolidine derivatives (Hayashi– Jørgensen catalysts) are considered “work horses” in organocatalysis. This report describes a new effective ferrocenylpyrrolidine catalyst that is able to perform well in benchmark organocatalytic reactions (see figure). The ferrocene moiety controls the conformational space and a simple alkyl group effectively covers a face of the derived enamine. This new framework
1-phenyl-3-aryl-2-propyne-1-one useful as calcium uptake inhibitors
申请人:Merrell Dow Pharmaceuticals Inc.
公开号:US05223518A1
公开(公告)日:1993-06-29
This invention relates to 1-phenyl-3-aryl-2-propyne-1-ones, the use of these compounds as calcium uptake inhibitors in leukocytes and thrombocytes, and pharmaceutical compositions containing these compounds as active ingredients, and the process of their preparation.