Reformatsky-type addition of esters of α-halogeno carboxylic acids to aldehydes and ketones in the presence of Fe(CO)5
作者:A. B. Terent'ev、T. T. Vasil'eva、N. A. Kuz'mina、E. I. Mysov、N. S. Ikonnikov、N. Yu. Kuznetsov、Yu. N. Belokon
DOI:10.1007/bf02496013
日期:1999.6
Reformatsky-type addition of esters of α-halogeno carboxylic acids to aldehydes and ketones in the presence of Fe(CO)5 and an activating agent (CBrCl3 or I2) afforded the corresponding esters of β-hydroxy acids in good yields. Possible reaction mechanisms are discussed.
Biocatalyzed Enantioselective Reduction of Activated C=C Bonds: Synthesis of Enantiomerically Enriched α-Halo-β-arylpropionic Acids
作者:Elisabetta Brenna、Francesco G. Gatti、Alessia Manfredi、Daniela Monti、Fabio Parmeggiani
DOI:10.1002/ejoc.201100537
日期:2011.7
The enantioselective biocatalyzed reduction of the C=C bond of some (Z)-methyl α-halo-β-arylacrylates was investigated. The reaction was performed by baker'syeast fermentation and Old Yellow Enzymes 1–3 mediated biotransformations. The final products were, respectively, enantiomerically enriched (S)-α-halo-β-arylpropionic acids and their methyl esters, and ester hydrolysis was promoted in the whole
A Novel and Convenient Protocol for Synthesis of α-Haloacrylates
作者:Biao Jiang、Ying Dou、Xiangya Xu、Min Xu
DOI:10.1021/ol702859y
日期:2008.2.1
A.novel and convenient protocol for synthesis of alpha-haloacrylates starting from phosphonium ylide and aldedyde or alcohol was described. Halodimethylsulfonium halide was used for the first time in halogenation of phosphonium ylide. Good yield as well as a high Z/E ratio were shown in representative cases, and an umpolung dimethyl sulfide-ylide species might be involved as an intermediate.
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作者:A. B. Terent'ev、T. T. Vasil'eva、N. A. Kuz'mina、N. E. Mysova、O. V. Chakhovskaya
DOI:10.1023/a:1013175403637
日期:——
Pentacarbonyliron promotes addition of alpha-halocarboxylic acid esters at the carbonyl group of benzaldehyde and its para-substituted analogs. The substituent in the benzene ring strongly affects the process.