Visible-Light-Mediated Rose Bengal-Catalyzed α-Hydroxymethylation of Ketones with Methanol
作者:Jingya Yang、Dongtai Xie、Hongyan Zhou、Shuwen Chen、Jiaokui Duan、Congde Huo、Zheng Li
DOI:10.1002/adsc.201800467
日期:2018.9.17
A visible‐light‐mediated α‐hydroxymethylation of ketones using methanol as the hydroxymethylating reagent has been developed. Using 1 mol% rose bengal as the photosensitizer and air as the green oxidant, the reactions proceeded smoothly at room temperature. Experimental studies indicate the reaction proceeded via a radical pathway.
Electrooxidative α-hydroxymethylation of ketones with dimethylformamide as the carbon source
作者:Jin-Ming Zheng、Yi-Fei Li、Yi-Xiang Pan、Xiao-Dong Hu、Xiao-Xia Ye、Ren-Hao Li
DOI:10.1039/d3gc00144j
日期:——
An environmentally benign electrochemical approach has been developed for the α-hydroxymethylation of ketones using N,N-dimethylformamide as the carbon source for the construction of β-hydroxy ketones. This method does not require metal catalysts or chemical oxidants and proceeded smoothly at room temperature to demonstrate tolerance of a broad range of functional groups.
Proline-catalyzed facile access to Mannich adducts using unsubstituted azoles
作者:Nagarapu Srinivas、Kalpana Bhandari
DOI:10.1016/j.tetlet.2008.09.155
日期:2008.12
A novel and facile method for the direct construction of C-C-N bond with unsubstituted azoles under Mannich conditions is developed for the first time. The reaction is catalyzed efficiently by.-proline to give the Mannich adducts 1a-10b in DMSO, whereas in water, insertion of two successive bonds, C-C-N and C-C-O occurred to give compounds 11a-20b. The latter are deformylated readily into the desired products 1a-10b Under basic conditions. Mechanistic aspects for the formation of these products are discussed. (c) 2008 Elsevier Ltd. All rights reserved.
Efficient one-pot selective reduction of esters in β-ketoesters using LiHMDS and lithium aluminium hydride
作者:K. Sivagurunathan、S. Raja Mohamed Kamil、S. Syed Shafi、F. Liakth Ali Khan、R. Venkat Ragavan
DOI:10.1016/j.tetlet.2011.01.030
日期:2011.3
The ester functionality in β-keto esters is selectively reduced in one-pot, first by enolization using LiHMDS and then reduced with lithium aluminium hydride. This method produces β-hydroxyl ketones from the corresponding β-keto esters in high yield.