CONSECUTIVE INTRAMOLECULAR AZOMETHINE YLID CYCLOADDITION - PUMMERER REARRANGEMENT AS A STRATEGY FOR THE SYNTHESIS OF ENANTIOMERICALLY PURE 5-(HYDROXYMETHYL)PROLINES
Lm. Harwood et Ia. Lilley, CONSECUTIVE INTRAMOLECULAR AZOMETHINE YLID CYCLOADDITION - PUMMERER REARRANGEMENT AS A STRATEGY FOR THE SYNTHESIS OF ENANTIOMERICALLY PURE 5-(HYDROXYMETHYL)PROLINES, Synlett, (10), 1996, pp. 1010
The thiatricycle (2S, 6R, 8S, 12S)-(2), prepared in one pot by reactio
n of (5S)-5-phenylmorpholinone with (prop-2-enyl)thioethanal, is conve
rted stereoselectively to sulfoxide (5) which undergoes regio- and ste
reoselective Pummerer rearrangement. Subsequent elaboration furnishes
(2S, 4R, 5S)-5-(hydroxymethyl)-4-methylproline (9).