mono-selective alkylation of various pyridines and azines with unactivated alkenes and vinylarenes using a heterobimetallic Rh–Al catalyst is reported. The use of aliphatic alkenes exclusively affords the linear alkylation products, while vinylarenes mainly afford branched alkylation products. The details of the reaction mechanism are revealed by DFT calculations: the reductive elimination of the products
Cobalt-catalyzed acceptorless dehydrogenative coupling of aminoalcohols with alcohols: direct access to pyrrole, pyridine and pyrazine derivatives
作者:Siba P. Midya、Vinod G. Landge、Manoj K. Sahoo、Jagannath Rana、Ekambaram Balaraman
DOI:10.1039/c7cc07427a
日期:——
example is reported of a new, molecularly defined SNS-cobalt(II) catalyst for the acceptorless dehydrogenative coupling (ADC) of unprotected amino alcohols with secondary alcohols leading to pyrrole and pyridinederivatives.
PHOSPHINE FREE COBALT BASED CATALYST, PROCESS FOR PREPARATION AND USE THEREOF
申请人:COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
公开号:US20200384451A1
公开(公告)日:2020-12-10
The present invention discloses a phosphine free cobalt based catalyst of formula (I) and a process for preparation thereof. The present invention further discloses a process for the synthesis of aromatic heterocyclic compounds of formula (II) and pyrazine derivative using the phosphine free cobalt based catalyst of formula (I).
Palladium-catalyzed iminocarbonylative cross-coupling reaction between haloarenes, t-BuNC, and 9-alkyl-9-BBN derivatives. Synthesis of alkyl aryl ketones
derivatives, t-butylisocyanide, and haloarenes was carried out in dioxane at 50°C in the presence of K3PO4 and a catalytic amount of Pd(PPh3)4. The reaction provides alkyl aryl ketones in high yields after hydrolysis of the ketimine intermediates.
9-烷基-9-BBN衍生物,叔丁基异氰化物和卤代芳烃之间的交叉偶联反应是在二恶烷中于50°C在K 3 PO 4和催化量的Pd(PPh 3)4存在下进行的。酮亚胺中间体水解后,该反应以高收率提供烷基芳基酮。
A Convenient Method for the Regioselective Synthesis of 4-Alkyl(aryl)pyridines Using Pyridinium Salts
作者:Kin-ya Akiba、Y\={u}ji Iseki、Makoto Wada
DOI:10.1246/bcsj.57.1994
日期:1984.7
(81–94%). The dihydropyridines were oxidized by oxygen to give 4-alkyl(aryl)pyridines (38–68%). Grignardreagents also reacted with 1-t-butyldimethylsilylpyridinium triflate with almost complete regioselectivity (>99%) to afford the corresponding 1,4-dihydropyridines, which were easily oxidized by oxygen to give 4-substituted pyridines in higher yields than above (58–70%).