Abstract
[reaction: see text] A highly enantioselective synthetic method for (R)-alpha-alkylserines was developed by the phase-transfer catalytic alkylation of o-biphenyl-2-oxazoline-4-carboxylic acid tert-butyl ester (4i) using cinchona-derived phase-transfer catalyst N(1)-(9-anthracenylmethyl)-O(9)-allyl-dihydrocinchonidinium bromide (up to 96% ee).
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