Synthesis of both enantiomers of cyclic methionine analogue: (R)- and (S)-3-aminotetrahydrothiophene-3-carboxylic acids
作者:Makoto Oba、Atsushi Shimabukuro、Miyako Ono、Mitsunobu Doi、Masakazu Tanaka
DOI:10.1016/j.tetasy.2013.03.010
日期:2013.4
A method of synthesizing an optically active cyclic methionine analogue, 3-aminotetrahydrothiophene-3-carboxylic acid (At(5)c), is described. A Bucherer-Bergs reaction of 4,5-dihydro-3(2H)-thiophenone and the subsequent alkaline hydrolysis of a hydantoin, followed by Cbz protection of the amine, afforded racemic Cbz-At(5)c (+/-)-3 in excellent yield. Diastereomeric esters derived from Cbz-At(5)c (+/-)-3 and (R)-BINOL could be separated by column chromatography to give both diastereomers with >99% de. X-ray crystallographic analysis revealed the absolute configuration of the synthesized amino acid derived from the less polar diastereomeric ester to be (S). (C) 2013 Elsevier Ltd. All rights reserved.