Abstract
We report an efficient protocol for synthesis of methyl 2-[(tert-butoxycarbonyl) amino]-3-hydroxy-3-phenylpropanoate (Erythro (±)) by simple reduction and methyl 2-[(tert-butoxycarbonyl) amino]-3-hydroxy-3-phenylpropanoate (Threo (±)) by inversion method. The erythro (±) isomer has been obtained in excellent yield (93%) using sodium borohydride in methanol at -40°C. The erythro isomer has been effectively converted into its threo (±) with 100% efficiency, by inversion, using methanesulfonyl chloride, cesium acetate and crown ether-18-6. The salient features of this method include cost effectiveness, excellent yields and scope for large-scale synthesis, which makes the method an attractive addition to the applicable methodologies.
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Mrs. Vijaya Lakshmi Chapala is thankful to GITAM deemed to be University, Hyderabad for providing the laboratory facilities.
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C, V.L., Katari, N.K., M, G.P. et al. Methyl 2-[(tert-Butoxycarbonyl)amino]-3-hydroxy-3-phenylpropanoate: Synthesis of Erythro (±) Isomer by Reduction and Threo (±) Isomer by Inversion Method. Russ J Gen Chem 91, 2539–2545 (2021). https://doi.org/10.1134/S1070363221120252
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DOI: https://doi.org/10.1134/S1070363221120252