非表示:
キーワード:
-
要旨:
N,N-Dibenzlamino aldehydes, readily accessible from amino acids, can be converted into λ-N,N-dibenzylamino α,β-didehydro amino acid esters without racemization; these undergo stereoselective Diels-Alder reactions and 1,3-dipolar cycloaddition with diazomethane, the sense of diastereoselectivity being opposite to that predicted by the conventional principle of 1,3-allylic strain
