cycloheptane rings were constructed from substituted 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol, and sterically hindered ketones following a (4 + 1), (5 + 1), and (6 + 1) strategy, respectively. This reaction provides an atom economic methodology to construct two C-Cbonds at a single carbon center generating high-value cycloalkanes from readily available alcohols as feedstock using an earth-abundant
Indium−Copper and Indium−Silver Mediated Barbier–Grignard-Type Alkylation Reaction of Aldehydes Using Unactivated Alkyl Halides in Water
作者:Zhi-Liang Shen、Yan-Lin Yeo、Teck-Peng Loh
DOI:10.1021/jo8000589
日期:2008.5.1
developed for the Barbier–Grignard-typealkylationreaction of aldehydes (including aliphatic version) usingunactivatedalkylhalides in water in the presence of an In/CuI/I2 or In/AgI/I2 system. The reactions proceeded more efficiently in water than in organic solvent. In, CuI or AgI, and I2 were all essential for the efficient progress of the reactions. A radical-type reaction mechanism was studied
在In / CuI / I 2或In / AgI / I 2系统存在下,使用未活化的烷基卤化物在水中进行醛的Barbier-Grignard型烷基化反应(包括脂肪族)的有效方法。该反应在水中比在有机溶剂中更有效地进行。In,CuI或AgI和I 2对反应的有效进行都是必不可少的。研究并提出了一种以4-戊烯为底物的自由基型反应机理。
Nickel-Catalyzed Addition of Aryl Bromides to Aldehydes To Form Hindered Secondary Alcohols
作者:Kevin J. Garcia、Michael M. Gilbert、Daniel J. Weix
DOI:10.1021/jacs.8b13709
日期:2019.2.6
Transition-metal-catalyzed addition of aryl halides across carbonyls remains poorly developed, especially for aliphatic aldehydes and hindered substrate combinations. We report here that simple nickel complexes of bipyridine and PyBox can catalyze the addition of aryl halides to both aromatic and aliphatic aldehydes using zinc metal as the reducing agent. This convenient approach tolerates acidic functional
A new method for alkylation of aromatic aldehydes using alkylboron chloride derivatives in the presence of oxygen
作者:George W Kabalka、Zhongzhi Wu、Yuhong Ju
DOI:10.1016/s0040-4020(02)00237-5
日期:2002.4
Reactions of aromatic aldehydes with alkylboron chloride derivatives in the presence of oxygen have been investigated. Dialkylboron chlorides react with aryl aldehydes to produce arylalkylmethanols in good to excellent yields. Under the same reaction conditions, alkylboron dichlorides lead to the formation of arylalkyl chlorides.
Alkylation of aromatic aldehydes with alkylboron chloride derivatives
作者:George W Kabalka、Zhongzhi Wu、Yuhong Ju
DOI:10.1016/s0040-4020(00)01160-1
日期:2001.2
The reaction of aryl aldehydes with alkylboron chlorides has been investigated. Monoalkylboron dichlorides react with aryl aldehydes in hexane under reflux conditions to give a mixture of dichloroarylmethane and benzyl chloride. Under the same reaction conditions, dialkylboron chlorides lead to formation of a mixture of benzyl chloride and the chloroalkylation product. In the presence of a base such