Remarkable ketene substituent dependent effect of photo irradiation on the diastereoselectivity in the Staudinger reaction
作者:Zhanhui Yang、Jiaxi Xu
DOI:10.1016/j.tetlet.2011.12.003
日期:2012.2
Controlling diastereoselectivity is a challenging issue in the Staudinger reaction. The influence of ultraviolet irradiation on the stereoselectivity in the Staudinger reaction has been investigated. The results indicate that ultraviolet irradiation is one of the most important means to regulate the diastereoselectivity of the products in the Staudinger reaction, whatever ketenes were generated from
Synthesis of 3-Alkoxy/Aryloxy-β-lactams Using Diazoacetate Esters as Ketene Precursors Under Photoirradiation
作者:Jiaxi Xu、Hengzhen Qi、Zhanhui Yang
DOI:10.1055/s-0030-1259485
日期:2011.3
imines from their trans-isomers into syn-isomers under UV irradiation. The reported method represents a metal-free and neutral approach for the synthesis of 3-alkoxy/aryloxy-β-lactams. diazoacetate - imine -ketene- β-lactam - photoirradiation - Staudinger reaction
Arrieta, Ana; Lecea, Begona; Palomo, Claudio, Journal of the Chemical Society. Perkin transactions I, 1987, p. 845 - 850
作者:Arrieta, Ana、Lecea, Begona、Palomo, Claudio
DOI:——
日期:——
Pyrolysis of azetidinone derivatives: a versatile route towards electron-rich alkenes, C-1 allylation and/or homologation of aldehydes
作者:Nouf S. Al-Hamdan、Osama M. Habib、Yehia A. Ibrahim、Nouria A. Al-Awadi、Osman M. E. El-Dusouqui
DOI:10.1039/c4ra01024h
日期:——
β-thiolactams led essentially to stereoselective synthesis of the high energy electron-rich Z-alkenes. Extension of this methodology to the pyrolysis of 3-allyloxy derivatives gave a simple direct route to the synthetically important 4-pentenal. These pyrolytic transformations convert aldehydes to aryloxyalkenes (a protected homologation) and 4-pentenal (a C-1 allylation and homologation). The starting