Synthesis 2015; 47(01): 113-123
DOI: 10.1055/s-0034-1379168
paper
© Georg Thieme Verlag Stuttgart · New York

A Versatile Approach to Noncoded β-Hydroxy-α-amino Esters and α-Amino Acids/Esters from Morita–Baylis–Hillman Adducts

Hamid Ullah
a   University of Campinas, Institute of Chemistry, Laboratory of Synthesis of Natural Products and Drugs, P. O. Box 6154, 13083-970 Campinas, SP, Brazil
,
André V. Ferreira
a   University of Campinas, Institute of Chemistry, Laboratory of Synthesis of Natural Products and Drugs, P. O. Box 6154, 13083-970 Campinas, SP, Brazil
b   Center for Nuclear Energy, University of São Paulo – CENA/USP, Stable Isotopes Laboratory, P. O. Box 96, 13400-970 Piracicaba, SP, Brazil
,
José A. Bendassolli
b   Center for Nuclear Energy, University of São Paulo – CENA/USP, Stable Isotopes Laboratory, P. O. Box 96, 13400-970 Piracicaba, SP, Brazil
,
Manoel T. Rodrigues Jr.
a   University of Campinas, Institute of Chemistry, Laboratory of Synthesis of Natural Products and Drugs, P. O. Box 6154, 13083-970 Campinas, SP, Brazil
,
André Luiz B. Formiga
c   University of Campinas, Institute of Chemistry, Laboratory of Coordination Chemistry, P. O. Box 6154, 13083-970 Campinas, SP, Brazil   Fax: +55(19)37883023   Email: coelho@iqm.unicamp.br
,
Fernando Coelho*
a   University of Campinas, Institute of Chemistry, Laboratory of Synthesis of Natural Products and Drugs, P. O. Box 6154, 13083-970 Campinas, SP, Brazil
› Author Affiliations
Further Information

Publication History

Received: 09 July 2014

Accepted after revision: 26 August 2014

Publication Date:
02 October 2014 (online)


Abstract

A simple and straightforward approach to the diastereoselective synthesis of noncoded β-hydroxy-α-amino esters from Morita–Baylis–Hillman (MBH) adducts is described. The strategy is based on a one-pot sequence involving an oxidative cleavage of the double bond of silylated Morita–Baylis–Hillman adducts, followed by the reaction with hydroxylamine hydrochloride/pyridine to form oximes. The stereoselective reduction of the oximes with the mixture MoCl5·nH2O/NaBH3CN led to the corresponding anti-β-hydroxy-α-amino esters in four steps in good overall yield and with diastereoselectivity higher than 95%. A slight modification of the synthetic approach has allowed for the racemic synthesis of a set of noncoded α-amino esters/acids and DOPA.

Supporting Information