Ruthenium(II) pincer-catalyzed α-olefination of nitriles is reported. This simple protocol provides a transformation for the catalyticsynthesis of β-disubstituted vinyl nitriles using secondary alcohols. This catalytic method has an extensive substrate scope, as arylmethyl nitriles, heteroarylmethyl nitriles, and aliphatic nitriles as well as cyclic, acyclic, symmetrical, and unsymmetrical secondary
Novel intermediate and processes for its preparation and conversion into a pharmacologically-active agent
申请人:——
公开号:US20030195376A1
公开(公告)日:2003-10-16
Processes for the preparation of Venlafaxine (IX) via the novel epoxy-nitrile intermediate (I), which when subjected to hydrogenation forms compound (X), and may subsequently be reduced to yield the desired product (IX). The epoxy-nitrile intermediate (I) itself may be synthesised via various alternative reaction strategies, from a range of starting materials. E.g. 4-methoxy-benzaldehyde (VI), upon treatment with cyclohexyl magnesium bromide yields compound (V). This in turn may be oxidised to yield compound (III), which forms compound (II) on treatment with an (x-keto-halogenation agent. Cyanation of compound (II), then yields the desired epoxy nitrile intermediate (I), from which Venlafaxine (IX) may be synthesised.
Process for preparation of phenethylamine derivatives
申请人:Kim Keun-Sik
公开号:US20070149813A1
公开(公告)日:2007-06-28
A process for the preparation of a compound of formula I,
wherein R
1
and R
2
are ortho or para substituents, independently selected from the group consisting of hydrogen, hydroxyl, C
1
-C
6
alkyl, C
1
-C
6
alkoxy, C
7
-C
9
aralkoxy, C
2
-C
7
alkanoyloxy, C
1
-C
6
alkylmercapto, halo and trifluoromethyl; R
3
is hydrogen or C
1
-C
6
alkyl; R
4
is hydrogen, C
1
-C
6
alkyl, formyl or C
2
-C
7
alkanoyl; n is one of the integers 0, 1, 2, 3 or 4; and the dotted line represents optional olefinic unsaturation;
comprising hydrogenating a compound of formula III,
in the presence of a nickel or cobalt catalyst at a temperature of about 5° C. to 25° C.
Intermediate and processes for its preparation and conversion into a pharmacologically-active agent
申请人:Alembic Limited
公开号:US06756502B2
公开(公告)日:2004-06-29
Processes for the preparation of Venlafaxine (IX) via the novel epoxy-nitrile intermediate (I), which when subjected to hydrogenation forms compound (X), and may subsequently be reduced to yield the desired product (IX). The epoxy-nitrile intermediate (I) itself may be synthesized via various alternative reaction strategies, from a range of starting materials. E.g. 4-methoxy-benzaldehyde (VI), upon treatment with cyclohexyl magnesium bromide yields compound (V). This in turn may be oxidized to yield compound (III), which forms compound (II) on treatment with an (x-keto-halogenation agent. Cyanation of compound (II), then yields the desired epoxy nitrile intermediate (I), from which Venlafaxine (IX) may be synthesized.
Oxygen-Dependent Ligand-Controlled Iron-Catalyzed Chemoselective Synthesis of Olefins and Vinyl Nitriles
作者:Amit Kumar Guin、Subhajit Chakraborty、Subhankar Khanra、Santana Chakraborty、Nanda D. Paul
DOI:10.1021/acs.orglett.4c00455
日期:2024.4.5
An oxygen-dependent ligand-controlled chemoselective synthesis of vinyl nitriles and E-olefins by coupling a variety of alcohols and benzyl cyanides, catalyzed by a well-characterized, air-stable, easy-to-prepare Fe(II) catalyst (1a) bearing a redox-active arylazo pincer (L1a) is reported. The azo-moiety of the ligand backbone acts as an electron and hydrogen reservoir, enabling catalyst 1a to efficiently
在特征良好、空气稳定、易于制备的 Fe(II) 催化剂的催化下,通过偶联多种醇和苯乙腈,进行乙烯基腈和E-烯烃的氧依赖性配体控制化学选择性合成 ( 1a )据报道,其具有氧化还原活性芳基偶氮钳( L 1a )。配体主链的偶氮部分充当电子和氢储存库,使催化剂1a能够分别在氧气和氩气气氛下选择性地以中等至良好的产率有效地生产广谱乙烯基腈和E-烯烃。