A Simple Synthesis of 2-Phenylethynyl- and 2-Phenylthioethynyl-2-substituted Phenylacetonitriles Under Phase-Transfer Catalytic (PTC) Conditions
作者:Andrzej Jończyk、Tomasz Kuliński
DOI:10.1080/00397919308011280
日期:1993.7
The efficient synthesis of 2-phenylethynyl- or 2-phenylthioethynyl-2-substituted phenylacetonitriles 4 and 5 from nitriles 3 and substituted dichloroethenes 1 or 2, respectively, in the presence of 50% aqueous sodium hydroxide and tetrabutylammonium hydrogen sulphate (TBAHS) as a catalyst (phase-transfer catalysis, PTC), has been accomplished.
One-flask, regiospecific conversions of allylic alcohols into 2-carbon-extended, conjugated dienoate esters. Use of a new sulfinyl orthoester
作者:Gary H. Posner、R. David Crouch、Chris M. Kinter、Jean Christophe Carry
DOI:10.1021/jo00025a008
日期:1991.12
Sixteen differently substituted primary and secondary allylic alcohols are shown to react with sulfinyl orthoacetate 1 at 100-degrees-C sequentially via a [3,3] sigmatropic rearrangement and then a beta-elimination of benzenesulfenic acid to form conjugated dienoate esters 5-13 in 45-95% yields. This one-flask, intramolecular carbon-carbon bond-forming process represents a simple and convenient method for regiospecific gamma-attachment of a two-carbon (ethoxycarbonyl)methylene unit via the synthetic equivalent of an S(N)2' process. Two examples are given in which rationally designed dienoates 20 and 24, prepared via this one-flask process and carrying a pendant alkene unit, undergo intramolecular 2 + 4 cycloaddition producing bicyclic cyclohexenes 21 and 25.
NAGASHIMA, ENKOU;SUZUKI, KUNIO;SEKIYA, MINORU, CHEM. AND PHARM. BULL., 1981, 29, N 5, 1274-1279
作者:NAGASHIMA, ENKOU、SUZUKI, KUNIO、SEKIYA, MINORU
DOI:——
日期:——
JPS5841891A
申请人:——
公开号:JPS5841891A
公开(公告)日:1983-03-11
Nagashima, Enkou; Suzuki, Kunio; Sekiya, Minoru, Chemical and pharmaceutical bulletin, 1981, vol. 29, # 5, p. 1274 - 1279