Directed Metal (Oxo) Aliphatic C–H Hydroxylations: Overriding Substrate Bias
摘要:
The first general strategy for a directing effect on metal (oxo)-promoted C-H hydroxylations is described. Carboxylic acid moieties on the substrate overcome unfavorable electronic, steric, and stereoelectronic biases in C-H hydroxylations catalyzed by the non-heme iron complex Fe(PDP). In a demonstration of the power of this directing effect, C-H oxidation is diverted away from an electronically favored C-1 H abstraction/rearrangement pathway in the paclitaxel framework to enable installation of C-2 oxidation in the naturally occurring oxidation state and stereoconfiguration.
[EN] STEREOSELECTIVE SYNTHESIS OF A 4,4-DISUBSTITUTED CYCLOHEXANEPROPANOIC ACID [FR] SYNTHESE STEREOSELECTIVE D'UN ACIDE CYCLOHEXANEPROPANOIQUE 4,4-DISUBSTITUE
Synthesis of 3- and 4-substituted cyclic α-amino acids structurally related to ACPD
作者:Francisco Alonso、Irene Micó、Carmen Nájera、José M. Sansano、Miguel Yus、Jesús Ezquerra、Belén Yruretagoyena、Ismael Gracia
DOI:10.1016/0040-4020(95)00586-w
日期:1995.9
The preparation of 3-substituted cyclopentanones 12-16, 4-substituted cyclohexanones 23–28 and cycloheptanones 38–41 is described. Substituents in the cycloalkanones are carboxylate, phosphonate or tetrazole groups, separated from the ring by a 0, 1, 2, or 3 carbon atoms chain. These cycloalkanones have been transformed into α-amino acids 9–11 by hydrolysis of the corresponding hydantoin derivatives
Cycloalkylfused indole, benzothiophene, benzofuran and indene derivatives
申请人:Sabb Louise Annmarie
公开号:US20060205759A1
公开(公告)日:2006-09-14
The present invention provides cycloalkylfused indole, benzothiophene, benzofuran, and indene derivatives, and methods for using them to, for example, treat, prevent and/or ameliorate central nervous system diseases by antagonizing 5-HT
1A
receptors and modulating serotonin levels.
CYCLOALKYLFUSED INDOLE, BENZOTHIOPHENE, BENZOFURAN AND INDENE DERIVATIVES
申请人:Sabb Louise Annmarie
公开号:US20080081910A1
公开(公告)日:2008-04-03
The present invention provides cycloalkylfused indole, benzothiophene, benzofuran, and indene derivatives, and methods for using them to, for example, treat, prevent and/or ameliorate central nervous system diseases by antagonizing 5-HT
1A
receptors and modulating serotonin levels.
Stereoselective Synthesis of a 4,4-Disubstituted Cyclohexanepropanoic Acid
申请人:Brands Marie Joseph Karel
公开号:US20070225520A1
公开(公告)日:2007-09-27
There is provided stereoselective route to a compound of formula I:
wherein R represents H or an alkali metal, Ar
1
represents 4-chlorophenyl and Ar
2
represents 2,5-difluorophenyl.
Stereoselective synthesis of a 4,4-disubstituted cyclohexanepropanoic acid
申请人:Merck & Co., Inc.
公开号:US07411088B2
公开(公告)日:2008-08-12
There is provided stereoselective route to a compound of formula I:
wherein R represents H or an alkali metal, Ar1 represents 4-chlorophenyl and Ar2 represents 2,5-difluorophenyl.