Component match in rhodium catalyzed three-component reactions of ethyl diazoacetate, H2O and aryl imines: a highly diastereoselective one-step synthesis of β-aryl isoserine derivatives
作者:Zhenqiu Guo、Taoda Shi、Jun Jiang、Liping Yang、Wenhao Hu
DOI:10.1039/b915013g
日期:——
Water and ethyl diazoacetate were found to be matched components for generating highly reactive nucleophilic oxonium ylide in the presence of a dirhodium acetate catalyst. Simultaneous trapping of the oxonium ylide intermediate with aryl imines gave β-aryl isoserine derivatives with high diastereoselectivity.
Synthesis of oxazolidines using DMSO/P4O10 as a formaldehyde equivalent
作者:Jianmei Wang、Fernande D. Rochon、Yan Yang、Ling Hua、Margaret M. Kayser
DOI:10.1016/j.tetasy.2007.04.017
日期:2007.5
Compounds containing a substituted oxazolidine ring were prepared in excellent yields in two steps from cis or trans 3-phenylglycidate. When an electron donating amine was used in the nucleophilic opening of an epoxide, treatment of the resulting beta-amino-alpha-hydroxy ester with DMSO/P4O10 led to the formation of cis or trans oxazolidines. This simple and practical procedure was readily adapted to the synthesis of enantiopure oxazolidines, using DMSO/P4O10 because of the availability of the enantiopure halohydrins from enzymatic reduction of the beta-chloro-alpha-ketoester. (C) 2007 Elsevier Ltd. All rights reserved.
Iqbal, Javed; Mukhopadhyay, Manoj; Das, Bhaskar C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1997, vol. 36, # 6, p. 498 - 506
作者:Iqbal, Javed、Mukhopadhyay, Manoj、Das, Bhaskar C.、Rajesh、De, Asit、Sanghi, Rashmi、Jain, Swati、Nandy, Jyoti P.
DOI:——
日期:——
Iqbal, Javed; Mukhopadhyay, Manoj; Das, Bhaskar C., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1997, vol. 36, # 6, p. 498 - 506
作者:Iqbal, Javed、Mukhopadhyay, Manoj、Das, Bhaskar C.、Rajesh、De, Asit、Sanghi, Rashmi、Jain, Swati、Nandy, Jyoti P.