[reaction: see text] A practical method for the synthesis of opticallyactive styrene oxides has been developed via formation of opticallyactive 2-chloro-1-phenylethanols generated by reductive transformation of ring-substituted 2-chloroacetophenones. The opticallyactive alcohols with up to 98% ee are obtainable from the asymmetric reduction of acetophenones with an S/C = 1000-5000 with a formic
[反应:见正文]通过形成由环取代的2-氯苯乙酮的还原转化而生成的光学活性的2-氯-1-苯基乙醇,已经开发了一种合成光学活性的苯乙烯氧化物的实用方法。ee高达98%的旋光性醇可通过将S / C = 1000-5000的苯乙酮与含有明确定义的手性Rh络合物CpRhCl [(R,R)- tsdpen]。
A practical synthesis of optically active aromatic epoxides via asymmetric transfer hydrogenation of α-chlorinated ketones with chiral rhodium–diamine catalyst
A practical method for the synthesis of optically active aromatic epoxides has been developed via the formation of optically active α-chlorinated alcohols and intramolecular etherification. Optically active alcohols with up to 99% ee can be obtained from the asymmetric reduction of aromaticketones with a substrate/catalyst ratio of 1000–5000 using a formic acid/triethylamine mixture containing a well-defined
Rh(III)-catalyzed annulation of azobenzenes and α-Cl ketones toward 3-acyl-2H-indazoles
作者:Huan Li、Yuxuan Han、Zi Yang、Zhenyu Yao、Lianhui Wang、Xiuling Cui
DOI:10.1016/j.cclet.2020.12.027
日期:2021.5
afforded in up to 97% yields for more than 30 examples. The obtained products are potentiallyvaluable in organic synthesis and drug discovery. This protocol featured with high efficiency, extensive functional group tolerance and mild reaction conditions. The one-step efficient construction of an anti-inflammatory agent confirms the practicability of this procedure.
Mild and Efficient α-Chlorination of Carbonyl Compounds Using Ammonium Chloride and Oxone (2KHSO<sub>5</sub>·KHSO<sub>4</sub>·K<sub>2</sub>SO<sub>4</sub>)
A simple protocol for the α-monochlorination of ketones and 1,3-dicarbonyl compounds utilizing NH4Cl as a source of chlorine and Oxone as an oxidant in methanol without catalyst is presented. The reaction proceeds at ambient temperature in yields ranging from moderate to excellent.
The present invention provides benzimidazole thiophene compounds pharmaceutical compositions containing the same, processes for preparing the same and their use as pharmaceutical agents.