Sodium Perborate Catalyzed Selective Transesterification of<i>β</i>-Keto Esters under Neutral Conditions
作者:B. P. Bandgar、V. S. Sadavarte、L. S. Uppalla
DOI:10.1246/cl.2001.894
日期:2001.9
Transesterification of β-ketoesters with various alcohols has been carried out using sodium perborate as an inexpensivecatalystunderneutralconditions. The effectiveness of the protocol is manifested in its selectivity towards β-ketoesters whereas other esters are found to be unreactive under these reaction conditions.
Simple and high yielding syntheses of β-keto esters catalysed by zeolites
作者:B.S. Balaji、Bhanu M. Chanda
DOI:10.1016/s0040-4020(98)00804-7
日期:1998.10
Simple and high yielding syntheses of several β-keto esters, catalysed by zeolite Hβ are reported. The methods developed include condensation of aldehydes with ethyl diazoacetate and transesterification of β-keto esters with primary, secondary, allylic and benzylic alcohols etc., all catalysed by Hβ. It was further observed that under microwave irradiation the yields of many aromatic β-keto esters
An unusual dianion equivalent from acylsilanes for the synthesis of substituted β-keto esters
作者:Chris V. Galliford、Karl A. Scheidt
DOI:10.1039/b801597j
日期:——
The reaction of lithiated diazo esters with acylsilanes generates a remarkable intermediate en route to highly substituted beta-keto esters.
锂化重氮酯与酰基硅烷的反应在生成高度取代的β-酮酯的过程中产生了显着的中间产物。
Ir-Catalyzed Regio- and Enantioselective Decarboxylative Allylic Alkylations
作者:Hu He、Xiao-Jian Zheng、Yi Li、Li-Xin Dai、Shu-Li You
DOI:10.1021/ol7019394
日期:2007.10.1
[Ir(COD)Cl]2/phosphoramidite ligand 1a was found to be an efficient catalytic system for the highly regio- and enantioselective decarboxylative alkylation of gamma-substituted allyl beta-ketocarboxylates, affording the branched products with up to >99/1 branched-linear ratio and 96% ee.