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.
Inotropic, vasodilator and low Km, cAMP-selective, cGMP-inhibited phosphodiesterase (PDE III) inhibitory activities of 4a-methyl-4,4a-dihydro-5H-indeno[1,2-c]pyridazin-3(2H)-ones and 4a-methyl-4,4a,5,6-tetrahydrobenzo[h]cinnolin-3(2H)-ones
Novel 7-substituted-4,4a-dihydro-4a-methyl-5H-indenol[1,2-c]pyridazin-3[2H]-ones and 8-substituted-4a-methylbenzo[h]cinnolin-3[2H]-ones have been synthesized and their PDE III inhibitory, inotropic and vasodilator potencies compared with those of their normethyl analogues and their bicyclic 4,5-dihydro-6-phenylpyridazinone analogues. The structure-activity relationships of the tricyclic pyridazinones differ from those of bicyclic pyridazinones mainly in respect of the effect of introducing the methyl group into the pyridazinone ring. Whilst in the 4,5-dihydro-6-phenylpyridazin-3(2H)-ones, introduction of a 5-methyl group has been widely reported to lead to compounds of significantly greater potency, the novel tricyclic 4a-methylpyridazinones showed similar levels of inotropic, vasodilator and PDE III inhibitory potency to their normethyl analogues. Possible reasons for this difference in behaviour are discussed.
Hydroxymethylation of Propiophenones in Aqueous Medium: A New Route to 1-Aryl-2-methyl-2-propen-1-ones