Solution and fluorous phase synthesis of β,β-difluorinated 1-amino-1-cyclopentane carboxylic acid derivatives
作者:Santos Fustero、Vanessa Rodrigo、María Sánchez-Roselló、Fatemeh Mojarrad、Ana Vicedo、Teresa Moscardó、Carlos del Pozo
DOI:10.1016/j.jfluchem.2008.04.006
日期:2008.10
An efficient protocol for the preparation of beta,beta-difluorinated 1-amino-1-cyclopentane carboxylic acid derivatives was developed. 2,2-Difluro-4-phenyl-3-butenoic acid 6 was used as substrate for the preparation of the starting vinyl difluoro imino esters 8. The key steps of this methodology rely on the chemo- and diastereoselective addition of allylzinc bromides over the iminic functionality of 8 and subsequent RCM reaction. This synthetic sequence was successfully applied to fluorous synthesis. (C) 2008 Elsevier B.V. All rights reserved.
Pathway for the Stereocontrolled <i>Z</i> and <i>E</i> Production of α,α-Difluorine-Substituted Phenyl Butenoates
作者:Wadih Ghattas、Corinna R. Hess、Gilles Iacazio、Renaud Hardré、Judith P. Klinman、Marius Réglier
DOI:10.1021/jo061022s
日期:2006.10.1
and 1b together with the corresponding acids 2a and 2b is described. The procedures involve stereocontrolled additions of •CF2CO2Et to phenylacetylene or β-bromostyrene. Compound 1a is easily obtained by addition of •CF2CO2Et to phenylacetylene via a mechanism where the stereochemistry is controlled by an electron-transfer process to produce predominantly the Z vinyl anion. The product 1b is obtained
描述了纯Z-和E- α,α-二氟-4-苯基-3-丁烯酸乙酯1a和1b以及相应的酸2a和2b的有效制备方法。该程序包括将• CF 2 CO 2 Et立体控制地添加到苯乙炔或β-溴苯乙烯中。化合物1a中很容易被加入得到• CF 2 CO 2的Et到苯乙炔经由其中的立体化学是通过电子转移过程控制,以产生主要为一个机构Ž乙烯基阴离子。产品图1b是通过• CF 2 CO 2 Et通过Z-或E -β-溴苯乙烯的加成消除反应而获得的,该机理是立体化学受中间体构象平衡中的空间因素控制。
Gold-Catalyzed Povarov-Type Reaction of Fluorinated Imino Esters and Furans
作者:Álvaro Sanz-Vidal、Javier Miró、María Sánchez-Roselló、Carlos del Pozo、Santos Fustero
DOI:10.1021/acs.joc.6b01139
日期:2016.8.5
gold-catalyzed Povarov-type reaction of fluorinated imino esters and furans is described. The process, which takes place in dichoromethane at room temperature, gives rise to novel fluorinated tetrahydrofuran-fused tetrahydroquinolines in good yields and moderate levels of diastereoselectivity in a very simple manner. The reported examples expand the versatility of the Povarov reaction to unprecedented fluorinated