ASYMMETRIC-SYNTHESIS OF R-BETA-AMINO BUTANOIC ACID AND S-BETA-TYROSINE - HOMOCHIRAL LITHIUM AMIDE EQUIVALENTS FOR MICHAEL ADDITIONS TO ALPHA,BETA-UNSATURATED ESTERS
Michael addition of the lithium amide derived from R-N-(α-methylbenzyl)benzylamine to benzyl E-crotonate is highly stereoselective (95% d.e.) giving after debenzylation and crystallisation homochiral R-β-amino butanoic acid. A similar addition to methyl E-(p-benzyloxy)cinnamate is completely stereos...
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| Format: | Journal article |
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1991
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