Unusual reaction of β-hydroxy α-diazo carbonyl compounds with TsNHNCHCOCl/Et3N
作者:Weifeng Shi、Bo Zhang、Binge Liu、Feng Xu、Fengping Xiao、Jian Zhang、Shiwei Zhang、Jianbo Wang
DOI:10.1016/j.tetlet.2004.04.037
日期:2004.5
The reaction of β-hydroxy α-diazo carbonyl compounds with TsNHNCHCOCl/Et3N gave β-(p-tolylsulfonyl) α,β-unsaturated carbonyl compounds or β-(p-tolylsulfonyl) α-diazo esters. The reaction mechanism is discussed.
β-羟基α-重氮羰基化合物与TsNHNCHCOCl/ Et 3 N反应得到β-(对甲苯磺酰基)α,β-不饱和羰基化合物或β-(对甲苯磺酰基)α-重氮酯。讨论了反应机理。
2,3-Migration in Rh(II)-Catalyzed Reactions of β-Trifluoroacetamido α-Diazocarbonyl Compounds
作者:Feng Xu、Shiwei Zhang、Xiangnan Wu、Yu Liu、Weifeng Shi、Jianbo Wang
DOI:10.1021/ol061047d
日期:2006.7.1
The hydroxy group was directly converted into the trifluoroacetamido group by reacting,beta-hydroxy-alpha-diazo carbonyl compounds with trifluoroacetimidoyl chloride in the presence of DBU. Rh(II)-catalyzed reactions of these diazo compounds gave 2,3-migration products in high yields.
DBU-promoted condensation of acyldiazomethanes to aldehydes and imines under catalytic conditions
作者:Nan Jiang、Jianbo Wang
DOI:10.1016/s0040-4039(01)02375-9
日期:2002.2
The condensation of acyldiazomethanes to aldehydes and imines can be promoted with catalytic amount of DBU. The condensation gives β-hydroxy α-diazo carbonyl compounds or β-amino α-diazo carbonyl compounds in high yields.
Stereoselective Reduction of β-Hydroxy α-Ketoesters: A Concise Synthesis of<i>anti</i>-α,β-Dihydroxy Esters
作者:Jianbo Wang、Mingyi Liao、Wengang Yao
DOI:10.1055/s-2004-831210
日期:——
A new synthetic route to anti-α,β-dihydroxy esters has been developed. The new method consists of three steps starting from an aldehyde: the nucleophilic condensation with ethyl diazoacetate, oxidation with dimethyldioxirane, and stereoselective reduction with NaBH4.