In Situ Generated Cobalt Catalyst for the Dehydrogenative Coupling of Alcohols and Amines into Imines
作者:Fabrizio Bottaro、Robert Madsen
DOI:10.1002/cctc.201900392
日期:2019.6.6
An in situ formed cobalt catalyst is developed from cobalt(II)bromide, bis[2‐(diisopropylphosphino)‐4‐methylphenyl]amine and zinc metal. The catalyst mediates the acceptorless dehydrogenative coupling of alcohols and amines into imines with the release of hydrogen gas and the transformation is applied to the synthesis of a variety of imines from different alcohols and amines. The mechanism is investigated
Benzimidazole derivatives, their production and use
申请人:——
公开号:US20010047020A1
公开(公告)日:2001-11-29
Benzimidazole derivatives of the formula (I):
1
wherein the ring A is a benzene ring which may optionally contain substitution in addition to the R′ group; R
1
is hydrogen or an optionally substituted hydrocarbon residue; R
2
is a group capable of forming an anion or a group convertible thereinto; X is a direct bond or a spacer having an atomic length of two or less between the phenylene group and the phenyl group; R′ is carboxyl, an ester thereof, an amide thereof or a group capable of forming an anion or convertible to an anion; Y is —O—, —S(O)
m
— or —N(R
4
)— wherein m is an integer of 0, 1 or 2 and R
4
is hydrogen or an optionally substituted alkyl group; and n is an integer of 1 or 2; and the pharmaceutically acceptable salts thereof, have potent angiotensin II antagonistic activity and antihypertensive activity, thus being useful as therapeutic agents for treating circulatory system diseases such as hypertensive diseases, heart diseases (e.g. hypercardia, heart failure, cardiac infarction, etc.), strokes, cerebral apoplexy, nephritis, etc.
Benzimidazole derivatives of the formula (I): ##STR1## wherein the ring A is a benzene ring which may optionally contain substitution in addition to the R' group; R' is hydrogen or an optionally substituted hydrocarbon residue; R.sup.2 is a group capable of forming an anion or a group convertible thereinto; X is a direct bond or a spacer having an atomic length of two or less between the phenylene group and the phenyl group; R' is carboxyl, an ester thereof, an amide thereof or a group capable of forming an anion or convertible to an anion; Y is --O--, --S(O).sub.m -- or --N(R.sup.4)-- wherein m is an integer of 0, 1 or 2 and R.sup.4 is hydrogen or an optionally substituted alkyl group; and n is an integer of 1 or 2; and the pharmaceutically acceptable salts thereof, have potent angiotensin II antagonistic activity and antihypertensive activity, thus being useful as therapeutic agents for treating circulatory system diseases such as hypertensive diseases, heart diseases (e.g. hypercardia, heart failure, cardiac infarction, etc.), strokes, cerebral apoplexy, nephritis, etc.
Benzimidazole derivatives of the formula (I):
wherein the ring A is a benzene ring which may optionally contain substitution in addition to the R′ group; R1 is hydrogen or an optionally substituted hydrocarbon residue; R2 is a group capable of forming an anion or a group convertible thereinto; X is a direct bond or a spacer having an atomic length of two or less between the phenylene group and the phenyl group; R′ is carboxyl, an ester thereof, an amide thereof or a group capable of forming an anion or convertible to an anion; Y is —O—, —S(O)m— or —N(R4)— wherein m is an integer of 0, 1 or 2 and R4 is hydrogen or an optionally substituted alkyl group; and n is an integer of 1 or 2; and the pharmaceutically acceptable salts thereof, have potent angiotensin Π antagonistic activity and antihypertensive activity, thus being useful as therapeutic agents for treating circulatory system diseases such as hypertensive diseases, heart diseases (e.g. hypercardia, heart failure, cardiac infarction, etc.), strokes, cerebral apoplexy, nephritis, etc.
Benzaldimines as ligands for palladium in Suzuki–Miyaura reactions
作者:Dipankar Srimani、Amitabha Sarkar
DOI:10.1016/j.tetlet.2008.08.056
日期:2008.10
Schiff bases derived from substituted benzaldehydes are effective ligands for palladium(0) in the Suzuki-Miyaura coupling of phenylboronic acid with aryl, benzyl and allyl bromides under mild conditions. (c) 2008 Elsevier Ltd. All rights reserved.