The reaction of (2S)-N-benzoyl-2-tert-butyl-4-methylene-1,3-oxazolidin-5-one (9) with isopropylidene-triphenylphosphorane at room temperature gives the corresponding cis and trans spirocyclopropane derivatives 10 in ca. 1:1 ratio. After separation of both diastereomers, by recrystallization and flash chromatography, and further acid hydrolysis, enantiomerically pure (R)- and (S)-2,3-methanovaline 11
Synthesis of (1S)-1-amino-2,2-dimethylcyclopropane-1-carboxylic acid via PLE mediated hydrolysis of bis(2,2,2-trifluoroethyl) 2,2-dimethylcyclopropane-1,1-dicarboxylate
作者:Antonio Salgado、Tom Huybrechts、Annelies Eeckhaut、Johan Van der Eycken、Zsolt Szakonyi、Ferenc Fülöp、Alexey Tkachev、Norbert De Kimpe
DOI:10.1016/s0040-4020(01)00112-0
日期:2001.4
Hydrolysis of bis(2,2,2-trifluoroethyl) 2,2-dimethylcyclopropane-1,1-dicarboxylate with pig liver esterase afforded (1R)-2,2-dimethyl-1-(2,2,2-trifluoroethoxycarbonyl)-cyclopropane-1-carboxylic acid in high enantiomeric excess. This compound was rearranged to (1S)-2,2,2-trifluoroethyl-2,2-dimethyl-1-[(N-ethoxycarbonyl)amino]-cyclopropane-1-carboxylate via a Curtius type reaction with DPPA. Final alkaline hydrolysis gave (1S)-1-amino-2,2-dimethylcyclopropane-1-carboxylic acid. (C) 2001 Elsevier Science Ltd. All rights reserved.
KIRIHATA, MITSUNORI;SAKAMOTO, AKIO;ICHIMOTO, ITSUO;UEDA, HIROO;HONMA, MAM+, AGR. AND BIOL. CHEM., 54,(1990) N, C. 1845-1846