Tetrahedron Letters p. 7119 - 7122 (1991)
Update date:2022-08-16
Topics:
Knight
Ley
A novel synthesis of the pyrrolizidine alkaloids (-)-heliotridane (1) and (-)-isoretronecanol (2) is described. The key steps involve the conversion of a proline-derived carbamate (10) into the π-allyltricarbonyliron lactam complex (4) and the exhaustive carbonylation of this to give the pivotal intermediate γ-lactam (3). Lactam (3) has been converted into the title compounds by standard methods
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