A highly efficient and chemoselectivetransferhydrogenation of ketones in water has been successfully achieved with our newly developed catalyst. Simple ketones, as well as α- or β-functionalized ketones, are readily reduced. Formic acid is used as a traceless hydride source. At very low catalyst loading (S/C = 10 000 in most cases; S/C = 50 000 or 100 000 in some cases), the iridiumcatalyst is impressively
使用我们最新开发的催化剂,已成功实现了水中酮的高效化学选择性转移加氢。简单的酮以及α-或β-官能化的酮容易被还原。甲酸用作无痕氢化物源。在非常低的催化剂负载(小号/ ç = 10 000在大多数情况下;小号/ C ^ = 50 000或100 000在一些情况下)时,铱催化剂是减少在良好酮类到优异的产率令人印象深刻的高效率。TOF值可高达26000 mol mol -1 h -1。各种官能团是良好耐受的,例如杂芳基,芳氧基,烷氧基,卤素,氰基,硝基,酯,尤其是酸性亚甲基,苯酚和羧酸基团。
A Robust Nickel Catalyst for Cyanomethylation of Aldehydes: Activation of Acetonitrile under Base-Free Conditions
作者:Sumit Chakraborty、Yogi J. Patel、Jeanette A. Krause、Hairong Guan
DOI:10.1002/anie.201302613
日期:2013.7.15
room temperature coupling of aldehydes with acetonitrile under base‐free conditions. The catalytic system is long‐lived and remarkably efficient with high turnover numbers (TONs) and turnover frequencies (TOFs) achieved. The mild reaction conditions allow a wide variety of aldehydes, including base‐sensitive ones, to catalytically react with acetonitrile.
Efficient nickel catalyst for coupling of acetonitrile with aldehydes
作者:Lei Fan、Oleg. V. Ozerov
DOI:10.1039/b505778g
日期:——
A Ni complex of a diarylamido-based PNP ligand is an efficient and robust catalyst for coupling of acetonitrile with aldehydes.
二芳基酰胺基 PNP 配体的镍络合物是乙腈与醛偶联的高效、稳健催化剂。
Stereospecific Oxycyanation of Alkenes with Sulfonyl Cyanide
作者:Kensuke Kiyokawa、Miu Ishizuka、Satoshi Minakata
DOI:10.1002/anie.202218743
日期:2023.3.13
Intermolecular oxycyanation of alkenes using p-toluenesulfonyl cyanide (TsCN) in the presence of tris(pentafluorophenyl)borane (B(C6F5)3) as a catalyst was shown to be feasible. The developed method offers a simple, scalable, and straightforward approach to access synthetically useful β-hydroxy nitrile derivatives.
在三(五氟苯基)硼烷(B(C 6 F 5)3 )作为催化剂存在下,使用对甲苯磺酰氰(TsCN)进行烯烃的分子间氧氰化被证明是可行的。开发的方法提供了一种简单、可扩展且直接的方法来获取合成有用的β-羟基腈衍生物。
N-Heterocyclic carbene-catalyzed cyanomethylation of aldehydes with TMSAN
作者:Ye-Cheng Fan、Guang-Fen Du、Wan-Fu Sun、Wei Kang、Lin He
DOI:10.1016/j.tetlet.2012.02.080
日期:2012.4
N-Heterocyclic carbenes (NHCs) have been served as efficient catalysts for cyanomethylation of carbonyl compounds. In the presence of 5 mol % NHC, various aldehydes and 2,2,2-trifluoroacetophenone reacted with trimethylsilylacetonitrile (TMSAN) to give beta-hydroxynitriles in moderate to high yields. (c) 2012 Elsevier Ltd. All rights reserved.