Unexpected regioselective Heck arylation of ethyl (E)-4,4,4-trifluorocrotonate
摘要:
Palladium-catalyzed Heck reactions of ethyl (E)-4,4,4-trifluorocrotonate 1 with aryl bromides 2a-f gave an unexpected cr-arylated compound 4, ethyl (Z)-2-aryl-4,4,4-trifluorocrotonate, mainly rather than normal beta-arylated compound 3, ethyl (Z)-3-aryl-4,4,4-trifluorocrutonate. (C) 2000 Elsevier Science S.A. All rights reserved.
“High-surface alkali metals” can be conveniently prepared via deposition of corresponding metals on various supports such as sodium chloride, polyethylene, polypropylene and cross-linked polystyrene from their solutions in liquid ammonia. Alkali metals deposited on polymeric supports can be stored in form of stable suspensions in inert solvents and used for the acyloin and Dieckmann condensations and
Process for producing fused imidazole compound, reformatsky reagent in stable form, and process for producing the same
申请人:Nuwa Shigeru
公开号:US20050043544A1
公开(公告)日:2005-02-24
The present invention provides an industrially advantageous process for producing a steroid C
17,20
lyase inhibitor represented by the general formula (I):
and a Reformatsky reagent in a stable form suitable for the process.
In the present invention, a compound represented by the general formula (I) is produced by reducing a specific β-hydroxy ester compound derivative or a salt thereof obtained from a specific carbonyl compound in a Reformatsky reaction in the presence of a metal hydride complex and a metal halide, and then subjecting it to a ring-closing reaction. In the above Reformatsky reaction, it is useful to use a stable solution of a compound represented by the general formula BrZnCH
2
COOC
2
H
5
or a crystal of the compound which is represented by the formula (BrZnCH
2
COOC
2
H
5
.THF)
2
.
Reformatsky Reagent in Stable Form and Process for Producing the Same
申请人:Takeda Pharmaceutical Company Limited
公开号:EP2275411A2
公开(公告)日:2011-01-19
The present invention provides an industrially advantageous process for producing a steroid C17,20 lyase inhibitor represented by the general formula (I):
and a Reformatsky reagent in a stable form suitable for the process.
In the present invention, a compound represented by the general formula (I) is produced by reducing a specific β-hydroxy ester compound derivative or a salt thereof obtained from a specific carbonyl compound in a Reformatsky reaction in the presence of a metal hydride complex and a metal halide, and then subjecting it to a ring-closing reaction. In the above Reformatsky reaction, it is useful to use a stable solution of a compound represented by the general formula BrZnCH2COOC2H5 or a crystal of the compound which is represented by the formula (BrZnCH2COOC2H5·THF)2.