Stereoisomers of 4-amino-3-hydroxy-1-cyclohexanecarboxylic acid and 4-amino-3-oxo-1-cyclohexanecarboxylic acid as mimetics of a twisted cis-amide bond
摘要:
Stereoselective synthesis of the title compounds was performed. The relative configuration of methyl t-4-(tert-butoxycarbonylamino)-c-3-hydroxy-r-1-cyclohexanecarboxylate and methyl trans-4-(tert-butoxycarbonylamino)-3-oxo-r-1-cyclohexanecarboxylate was confirmed by X-ray diffraction methods. Analogues of cyclolinopeptide A (CLA) containing these twisted cis-amide bond mimetics were then synthesised. (C) 2001 Elsevier Science Ltd. All rights reserved.
reported for the conversion of alkenes to 1,2-dibromo alkanes via oxidative bromination using HBr paired with dimethylsulfoxide, which serves as the oxidant as well as cosolvent. The substrate scope includes 21 olefins brominated in good to excellent yields. Three of six styrene derivatives yielded bromohydrins under the reaction conditions.
Grewe et al., Chemische Berichte, 1956, vol. 89, p. 1978,1986
作者:Grewe et al.
DOI:——
日期:——
A Highly Efficient Method for the Bromination of Alkenes, Alkynes and Ketones Using Dimethyl Sulfoxide and Oxalyl Bromide
作者:Hongyu Tian、Baoguo Sun、Rui Ding、Jiaqi Li、Wenyi Jiao、Mengru Han、Yongguo Liu
DOI:10.1055/s-0037-1609560
日期:2018.11
α-bromoketones. The pairing of DMSO and oxalyl bromide is reported as a highlyefficient brominating reagent for various alkenes, alkynes and ketones. This bromination approach demonstrates remarkable advantages, such as mild conditions, low cost, short reaction times, provides excellent yields in most cases and represents a very attractive alternative for the preparation of dibromides and α-bromoketones.
Stereoisomers of 4-amino-3-hydroxy-1-cyclohexanecarboxylic acid and 4-amino-3-oxo-1-cyclohexanecarboxylic acid as mimetics of a twisted cis-amide bond
作者:Krzysztof Krajewski、Zbigniew Ciunik、Ignacy Z. Siemion
DOI:10.1016/s0957-4166(01)00062-3
日期:2001.3
Stereoselective synthesis of the title compounds was performed. The relative configuration of methyl t-4-(tert-butoxycarbonylamino)-c-3-hydroxy-r-1-cyclohexanecarboxylate and methyl trans-4-(tert-butoxycarbonylamino)-3-oxo-r-1-cyclohexanecarboxylate was confirmed by X-ray diffraction methods. Analogues of cyclolinopeptide A (CLA) containing these twisted cis-amide bond mimetics were then synthesised. (C) 2001 Elsevier Science Ltd. All rights reserved.