Selective Synthesis of <i>Z</i>-Silyl Enol Ethers via Ni-Catalyzed Remote Functionalization of Ketones
作者:Sinem Guven、Gourab Kundu、Andrea Weßels、Jas S. Ward、Kari Rissanen、Franziska Schoenebeck
DOI:10.1021/jacs.1c01797
日期:2021.6.9
the Z-selective synthesis of silyl enol ethers of (hetero)aromatic and aliphatic ketones via Ni-catalyzed chain walking from a distant olefin site. The positional selectivity is controlled by the directionality of the chain walk and is independent of thermodynamic preferences of the resulting silyl enol ether. Our mechanistic data indicate that a Ni(I) dimer is formed under these conditions, which
我们报告了一种远程官能化策略,该策略允许通过 Ni 催化的链从远处的烯烃位点步行来Z选择性合成(杂)芳族和脂肪族酮的甲硅烷基烯醇醚。位置选择性由链游走的方向性控制,并且与所得甲硅烷基烯醇醚的热力学偏好无关。我们的机理数据表明,在这些条件下形成Ni (I)二聚体,作为催化剂静止状态,并在与烷基溴反应后转化为 [Ni (II) -H] 作为活性链行走/功能化催化剂,最终生成稳定的 η 3 键合Ni (II) 烯醇作为关键的选择性控制中间体。
One-Pot Transition-Metal-Free Synthesis of Weinreb Amides Directly from Carboxylic Acids
作者:Danfeng Huang、Yulai Hu、Teng Niu、Ke-Hu Wang、Changming Xu、Yingpeng Su、Ying Fu
DOI:10.1055/s-0033-1340317
日期:——
directly fromcarboxylicacids, N,O-dimethylhydroxylamine, and phosphorus trichloride in one pot at 60 °C in toluene in high yields, thus avoiding the separation of the moisture and air sensitive intermediate P[NMe(OMe)]3 in advance. Sterically hindered carboxylicacids also give the corresponding Weinreb amides in excellent yields. Various functional groups are tolerated on the carboxylicacid. The method
A Convenient One-Pot Method for the Synthesis of N-Methoxy-N-methyl Amides from Carboxylic Acids
作者:Joong-Gon Kim、Doo-Ok Jang
DOI:10.5012/bkcs.2010.31.01.171
日期:2010.1.20
reaction temperatures, low yields, multi-step reactions, or tedious work-up procedures.We report a mild and convenient one-pot method for the synthesis of Weinreb amides from carboxylic acids employing trichloroacetonitrile (TCA) and triphenylphosphine (TPP). We first presumed that carboxylic acid chlorides formed
A MILD, ONE-POT METHOD FOR THE CONVERSION OF CARBOXYLIC ACIDS INTO THE CORRESPONDING WEINREB AMIDES
作者:Martin Banwell、Jason Smith
DOI:10.1081/scc-100104418
日期:2001.1
Reaction of various carboxylicacids with N,O-dimethylhydroxylamine under modified Mukaiyama amide coupling conditions affords the corresponding Weinerb amides in generally high yield.
A Convenient Method for the Conversion of Hindered Carboxylic Acids to <i>N</i>-Methoxy-<i>N</i>-methyl (Weinreb) Amides
作者:Jacqueline C. S. Woo、Erik Fenster、Gregory R. Dake
DOI:10.1021/jo048385h
日期:2004.12.1
The conversion of stericallyhindered carboxylic acids to N-methoxy-N-methyl amides can be efficiently carried out with 1.1 equiv of methanesulfonyl chloride, 3 equiv of triethylamine, and 1.1 equiv of N-methoxy-N-methylamine. Yields for this process range from 59% to 88%. The major byproduct in these reactions, N-methoxy-N-methylmethanesulfonamide, can be removed by placing the product mixture under