Abstract
N-(Diphenylmethylene)-α,β-didehydroamino acid methyl esters 2b-d are prepared with absolute geometric selectivity from inexpensive β-hydroxyamino acids through the intermediates N-(diphenylmethylene)- β-hydroxyamino acid methyl esters 1b-d. Besides, an easy conversion from E isomers to the corresponding Z isomers was performed, thus avoiding the use of the uncommon allo-β-hydroxyamino acids as starting materials.
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