threo-Selectivity in the conjugate addition of ammonia to 4,5-isopropylidenedioxypent-2-enoic esters has been exploited in a new synthesis of homochiral pyrrolidines; the origin of the diastereoselectivity is discussed.
I. Robina, R. P. Gearing, J. G. Buchanan and R. H. Wightman, J. Chem. Soc., Perkin Trans. 1, 1990, 2622 DOI: 10.1039/P19900002622
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