Bakers' yeast reductions of β-oxopyrrolidinecarboxylates: synthesis of (+)-cis-(2R,3S)-3-hydroxyproline and (–)-(1S,5S)-Geissman–Waiss lactone, a useful precursor to pyrrolizidine alkaloids
作者:Jeremy Cooper、Peter T. Gallagher、David W. Knight
DOI:10.1039/p19930001313
日期:——
Bakers' yeast reduction of the β-oxo proline derivative 5 leads to the cis-hydroxy ester 6 and thence to (+)-cis-(2R, 3S)-3-hydroxyproline 7, with > 90% enantiomeric enrichment. Subsequent one-carbon homologation leads to the (–)-Geissman–Waiss lactone 8, a useful precursor of pyrrolizidine alkaloids.
贝克的β-氧代脯氨酸衍生物5的酵母还原导致顺式-羟基酯6,并因此产生(+)-顺式-(2 R,3 S)-3-羟基脯氨酸7,对映体富集度> 90%。随后的一碳同源性导致(-)-Geissman-Waiss内酯8,是吡咯烷核生物碱的有用前体。