Catalytic direct-type substitution reaction of α-alkyl enolates: a Pd/Brønsted base-catalysed approach to the decarboxylative allylation of sulfonylimidates
作者:S. B. Jennifer Kan、Ryosuke Matsubara、Florian Berthiol、Shū Kobayashi
DOI:10.1039/b815845b
日期:——
mild and efficient process for the direct-type catalytic allylation of sulfonylimidates has been developed; this reaction represents the first example of Bronsted base-catalysed, in situ generation and use of alpha-alkyl enolates in substitution reactions; the success of this methodology stems from the tunable alpha-proton acidity and nucleophilicity of sulfonylimidates, which could be harnessed in the
A Bimetallic Catalyst and Dual Role Catalyst: Synthesis of <i>N</i>-(Alkoxycarbonyl)indoles from 2-(Alkynyl)phenylisocyanates
作者:Shin Kamijo、Yoshinori Yamamoto
DOI:10.1021/jo034254p
日期:2003.6.1
step proceeds with a cooperative catalytic activity of Pd and Cu. On the other hand, N-(alkoxycarbonyl)indoles are produced via the reaction of 2-(alkynyl)phenylisocyanates and alcohols under a catalytic amount of Na(2)PdCl(4) (5 mol %) or PtCl(2) (5 mol %). Pd(II) or Pt(II) catalyst exhibits dual roles; it acts as a Lewis acid to accelerate the addition of alcohols to isocyanates and as a typical transition-metal
Preparation of highly branched poly(vinyl acetate) by transfer to allylic carbonate comonomers
作者:Stephen Rimmer、Stephen Collins、Prodip Sarker
DOI:10.1039/b511870k
日期:——
Copolymerization of vinyl acetate with allyl carbonates that contain isopropyl groups yields highlybranched poly(vinyl acetates).
乙酸乙烯酯与含有异丙基的碳酸烯丙酯的共聚产生高度支化的聚乙酸乙烯酯。
[EN] PROCESS FOR PREPARING 6-O-SUBSITUTED ERYTHROMYCIN DERIVATIVES<br/>[FR] METHODE DE PREPARATION DE DERIVES D'ERYTHROMYCINE SUBSTITUES EN 6-O
申请人:ABBOTT LAB
公开号:WO2000078773A2
公开(公告)日:2000-12-28
In one aspect, the invention relates to a process for preparing 6-O-substituted erythromycin derivatives comprising reacting 2'-substituted and optionally 4'-substituted 9-oxime erythromycin derivatives with an alkylating agent in the presence of a palladium catalyst and phosphine. In another aspect, the invention relates to processes for preparing 6-O-substituted erythromycin ketolides using the palladium-catalyzed alkylation reaction.
Methods utilizing aryl thioimines in synthesis of erythromycin derivatives
申请人:——
公开号:US20020115835A1
公开(公告)日:2002-08-22
An efficient deoximation technique for use in synthesis of erythromycin derivatives, involving aryl thioimine intermediates is disclosed. The aryl thioimine intermediates can be utilized in a method for protecting a ketone of a ketone-containing erythromycin derivative as a thioimine; a method for deoximating an oxime-containing erythromycin derivative, or a method for preparing a 6-O-alkyl erythromycin derivative. Presently preferred erythromycin derivatives have a C-9 oxime or a C-9 ketone.