Kinetic resolution of 3-hydroxymethylbenzocycloalkanols by selective asymmetric hydrogen-transfer oxidation
摘要:
Kinetic resolution of 3-hydroxymethylbenzocycloalkanols was performed by selective asymmetric hydrogen-transfer oxidation using the Ru(II)-(S,S)-TsDPEN catalyst. Thus, several 3-hydroxymethyl-1-tetralols 7a-d afforded (1R,3R)-3-hydroxymethyl-1-tetralols (1R,3R)-7a-d and (S)-3-hydroxymethyl-1-tetralones (S)-9a-d, and 3-hydroxymethyl-1-indanol 7e gave (1R,3S)3-hydroxymethyl-1-indanol (1R,3S)-7e and (R)-3-hydroxymethyl-1-indanone (R)-9e, with high enantioselectivities. (C) 2003 Elsevier Ltd. All rights reserved.
Catalyst- and Additive-Free Electrochemical CO2 Fixation into Morita–Baylis–Hillman Acetates
作者:Giulio Bertuzzi、Marco Bandini、Andrea Brunetti
DOI:10.1055/a-2029-0488
日期:——
The electrochemical carboxylation of Morita–Baylis–Hillman (MBH) acetates with CO2 is presented. The process proceeds in the absence of transition-metal catalysts and relies on the cathodic reduction of MBH acetates to generate nucleophilic anions that are able to trap low-pressure CO2. Valuable succinate derivatives are obtained (20 examples) in high yields (up to 90%) and with excellent functional
介绍了Morita–Baylis–Hillman (MBH) 乙酸盐与 CO 2的电化学羧化反应。该过程在没有过渡金属催化剂的情况下进行,并依赖于 MBH 乙酸盐的阴极还原以产生能够捕获低压 CO 2的亲核阴离子。以高产率(高达 90%)和优异的官能团耐受性获得了有价值的琥珀酸酯衍生物(20 个例子)。记录了转化的显着底物控制(电子性质)区域选择性以及基于控制实验的机械原理。
Ruthenium dioxide in fluoro acid medium: II. Application to the formation of steganes skeleton by oxidative phenolic coupling.
作者:Jean-Pierre Robin、Yannick Landais
DOI:10.1016/s0040-4020(01)88186-2
日期:——
Ruthenium (IV) dioxide dihydrate in fluoro acidic medium was found to be a very efficient agent for the oxidative coupling of the phenolic lignans (+/-)-presteganes A and B. Different attempts to oxidise the diphenolic dibenzylbutanolide (+/-)-HPMF were also carried out, but were unsuccessful. Likely explanation for these failures are given.
BARNIER, JEAN-PIERRE;BLANCO, LUIS;GUIBE-JAMPEL, ERYKA;ROUSSEAU, GERARD, TETRAHEDRON, 45,(1989) N6, C. 5051-5058