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Synthesis 2008(20): 3237-3244
DOI: 10.1055/s-0028-1083154
DOI: 10.1055/s-0028-1083154
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Simple and Efficient Synthesis of Racemic Substituted Mandelic Acid Esters from Nonactivated Arenes and Ethyl Glyoxylate
Weitere Informationen
Received
24 March 2008
Publikationsdatum:
25. September 2008 (online)
Publikationsverlauf
Publikationsdatum:
25. September 2008 (online)

Abstract
Direct synthesis of racemic aromatic α-hydroxyacetic acid esters via Friedel-Crafts reaction of nonactivated, simple arenes with ethyl glyoxylate promoted by SnCl4 or AlCl3 is described. The use of SnCl4 opens a fast access to various alkyl- and aryl-substituted mandelic acids esters at room temperature within two hours in good yield (>80%) and with high regioselectivity. The procedure was successfully employed also for the alkylation of compounds with condensed aromatic rings. Alternative hydroxyalkylations with AlCl3 require longer reaction time and higher temperature to get a good yield.
Key words
arenes - Friedel-Crafts hydroxyalkylation - ethyl glyoxylate - α-hydroxy esters - Lewis acids - mandelic acids
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