Chiral non-racemic bicyclic lactams 2b,c, derived from (R)- and (S)-phenylglycinol, were used in the enantioselectivesynthesis of (−)-lupinine and 5-epitashiromine, respectively. The efficiency of the synthesis relied on the high diastereoselectivities of formation and reduction of compounds 2b,c.
Asymmetric synthesis of nitrogen heterocycles by reaction of chiral β-enaminocarbonyl substrates with acrylate derivatives
作者:Claude Agami、Luc Dechoux、Séverine Hebbe
DOI:10.1016/s0040-4039(02)00336-2
日期:2002.4
We have studied the reactivity of β-enaminoesters 1 (R2=OMe) or β-enaminoketone 1 (R2=Me), derived from (S)-phenylglycinol, with activated acrylate derivatives. Substrates 1 (R1=Me) afforded by aza-annulation oxazololactams 2 and 3,4-dihydro-2-pyridones 3. In the same conditions β-enaminoesters 1 (R1=H) furnish N-acylated oxazolidines 4.