Asymmetric synthesis of (S)-(−)-methyl tropinate: application of the iron acyl complex (S)-(+)-[(η5-C5H5)Fe(CO)(PPh3)COCH2Ph] as a homochiral phenylacetate enolate equivalent.
作者:Teresa M Baker、Graham J Bodwell、Stephen G Davies、Alison J Edwards、Michael R Metzler
DOI:10.1016/s0040-4020(01)87273-2
日期:1993.1
from homochiral (S)-[(η5-C5H5)Fe(CO)(PPh3)COCH35 with benzyne afforded the homochiral phenylacetyl complex (S)-[(η5-C5H5)Fe(CO)(PPh3)COCH2Ph] 4. Treatment of the lithium enolate derived from 4 with ClCH2OCH2Ph furnished the homochiral α-substituted complex (S,S)-(−)-[(η5-C5H5)-Fe(CO)(PPh3)COCH(CH2OCH2Ph)Ph] 14 (d.e. > 98%), which on decomplexation and debenzylation afforded (S)-(−)-methyl tropinate
Influence of aβ-Alkoxy Substituent on the CH Activation Chemistry of Alkyl Ethers
作者:Huw M. L. Davies、Jaemoon Yang
DOI:10.1002/adsc.200303089
日期:2003.9
CH activation reactions of 1,2-dimethoxyethane and methyl tert-butyl ether with methyl aryldiazoacetates or styryldiazoacetate catalyzed by Rh2(S-DOSP)4 result in the formation of 2-aryl- or 2-styryl-substituted propanoic acids with asymmetric induction up to 95% ee.
Cobalt-Catalyzed Enantioselective Hydroboration of α-Substituted Acrylates
作者:Manoj D. Patil、Kiron Kumar Ghosh、T. V. RajanBabu
DOI:10.1021/jacs.3c12020
日期:2024.3.13
C–N, and C–C bonds, these intermediates could serve as valuable chiral synthons, some from feedstock carbon sources, for the synthesis of propionate-bearing motifs including polyketides and related molecules. Two-step syntheses of “Roche” ester from methyl methacrylate (79%; er 99:1), arguably the most widely used chiral fragment in polyketide synthesis, and tropic acid esters (∼80% yield; er ∼93:7)
Enantiopure tert-butyl(phenyl)phosphine oxide. Chirality-recognition ability and mechanism
作者:Nigel Ribeiro、Kazuhiko Saigo
DOI:10.1016/j.tetasy.2009.11.021
日期:2009.12
When enantiopure tert-butyl(phenyl)phosphine oxide 1 was used as a resolving agent, it showed an acceptable to good chirality-recognition ability for several kinds of racemic carboxylic acids 2. A study on a chirality-recognition mechanism based on X-ray crystallographic analyses of the diastereomeric complexes of 2 with 1 revealed that the complex crystals consisted of helical columns and that 1 was not responsible for the formation of the helical column and occupied a void between the columns; although I interacted with 2 via a hydrogen bond to primarily form a pair with 2, the complex crystals were mainly stabilized by the accumulation of weak interactions, such as CH/pi, pi/pi and CH center dot center dot center dot O interactions, between 1/1, 1/2 and 2/2. (C) 2009 Elsevier Ltd. All rights reserved.
160. The action of Grignard reagents on methyl r-tropate and on methyl atropate