Synthesis of 4-Amino-2(5<i>H</i>)-furanones through Intra- and Intermolecular Nitrile Addition of Ester Enolates. Construction of Carbon Framework of an Antitumor Antibiotic Basidalin
ester group, deprotection, olefin isomerization and lactonization all in a single operation. The other is base-induced ringclosure of α-acyloxy nitriles. The two methods are applied to construction of the carbonframework of an antitumor antibiotic basidalin.
4-(<i>N,N</i>-Dimethylamino)pyridine Hydrochloride as a Recyclable Catalyst for Acylation of Inert Alcohols: Substrate Scope and Reaction Mechanism
作者:Zhihui Liu、Qiaoqiao Ma、Yuxiu Liu、Qingmin Wang
DOI:10.1021/ol4030875
日期:2014.1.3
4-(N,N-Dimethylamino)pyridine hydrochloride (DMAP·HCl), a DMAP salt with the simplest structure, was used as a recyclablecatalyst for the acylation of inert alcohols and phenols under base-free conditions. The reaction mechanism was investigated in detail for the first time; DMAP·HCl and the acylating reagent directly formed N-acyl-4-(N′,N′-dimethylamino)pyridine chloride, which was attacked by the
Zur Darstellung des 2-(1′-Hydroxybenzyl)-3-phenyl-1.3-oxazolidins
作者:Peter Tinapp
DOI:10.1002/ardp.19813140607
日期:——
Die Synthesedes 1.3‐Oxazolidins 8 aus dem Hydroxyaldehyd 1 ließ sich nicht verwirklichen. Sie gelingt jedoch in üblicher Weise, wenn der Aldehyd 1 zuvor an der Hydroxygruppe durch Acetylierung geschützt wird. Versuche zur Herstellung des O‐acetylierten Aldehyds 5 aus 1 ergaben hauptsächlich Gemische der diastereomeren Acetate des dimeren Aldehyds 1. Eine einfache Synthesevon5 aus dem O‐acetylierten
One-pot three components synthesis of O-acetylcyanohydrins with TMSCN, acetic anhydride and carbonyl compounds under solvent-free condition
作者:Santosh T. Kadam、Sung Soo Kim
DOI:10.1016/j.tet.2009.06.020
日期:2009.8
One-pot three components synthesis of O-acetylcyanohydrins has been developed in the presence of B(C6F5)3 as the catalyst. Variety of aldehydes or ketones reacts with TMSCN and acetic anhydride (Ac2O) under the influence of 1 mol % of B(C6F5)3 to give good to excellent yield of the products without solvent at rt.
在存在B(C 6 F 5)3作为催化剂的情况下,已经开发了O-乙酰基氰醇的一锅三组分合成法。在1摩尔%的B(C 6 F 5)3的影响下,各种醛或酮与TMSCN和乙酸酐(Ac 2 O)反应,从而在室温下在不使用溶剂的情况下获得了良好的优异收率。
Processes for producing alpha-cyanohydrin esters and alpha-hydroxy acids
申请人:Daicel Chemical Industries, Ltd.
公开号:EP0926134A2
公开(公告)日:1999-06-30
The present invention relates to a process for the preparation of compounds of formula (4) wherein a carbonyl compound of the formula (3) is reacted in the presence of a cyanogenation agent with an enol ester of the formula (1) or with an oxime ester of the formula (2):
wherein R1 through R8 have meanings given in the application.
The compound of formula (4) can be hydrolysed to obtain the corresponding compound of formula (5):