A New Route to Acyclic Diaminocarbenes via Lithium−Halogen Exchange
作者:David R. Snead、Ion Ghiviriga、Khalil A. Abboud、Sukwon Hong
DOI:10.1021/ol9013156
日期:2009.8.6
(ADC) from chloroamidinium salts. Convenient access to various ADC complexes (B, Rh, Ir, Pd) stems from a one-pot transmetalation protocol. Formation of a carbenoid species is suggested by 1D and 2D NMR studies with a 13C-labeled chloroamidinium precursor and also by X-ray structures of transitionmetal−carbenecomplexes. Rh-ADC complex 4 is an effective catalyst for the 1,2-addition of aryl boronic acids
Ni(COD)2/4-ClC6H4COR-catalyzed addition reactions of arylboroxines with aldehydes
作者:Chun-Hui Xing、Qiao-Sheng Hu
DOI:10.1016/j.tetlet.2009.12.033
日期:2010.2
Ni(COD)(2)/4-ClC6H4COR (R = H, CH3, Ph) was found to be an efficient catalyst system for the addition reactions of arylboroxines with aromatic and aliphatic aldehydes. The catalytically active species for Ni(CCD)(2)/4-ClC6H4COR catalyst systems was likely to be their oxidative addition adducts, 4-RCOC6H4-Ni(II)Cl(COD) complexes. (C) 2009 Elsevier Ltd. All rights reserved.
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作者:Yu. G. Budnikova、T. D. Keshner、Yu. M. Kargin
DOI:10.1023/a:1012381707114
日期:——
A method of electrosynthesis of secondary alcohols from aldehydes and organic halides under the action of nickel(0) complexes is proposed. The key stage is addition of sigma -complex RNi(I)bipy (bipy is 2,2'-bipyridine) to the aldehyde group.
A New Synthesis of 3-Isochromanone Derivatives Based on the Reaction of<i>o</i>-Acylbenzyllithiums with Ethyl Chloroformate
A new method for the preparation of 3-isochromanone derivatives is reported. The method consists of the ethoxycarbonylation of o-acylbenzyllithiums with ethylchloroformate and the subsequent NaBH4...
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‐Catalyzed Barbier Reactions of Aromatic Halides with Aromatic Aldehydes and Imines
作者:Marc Presset、Jérôme Paul、Ghania Nait Cherif、Nisanthan Ratnam、Nicolas Laloi、Eric Léonel、Corinne Gosmini、Erwan Le Gall
DOI:10.1002/chem.201806239
日期:2019.3.21
The reductive Barbier coupling of aromatic halides and electrophiles has been achieved using a CoBr2/1,10‐phenanthroline catalytic system and over stoichiometric amounts of zinc. The reaction displayed a broad scope of substrates, including (hetero)aryl chlorides as pro‐nucleophiles and aldehydes or imines as electrophiles, leading to diarylmethanols and diarylmethylamines in moderate to excellent