作者:M. Todd Hovey、Emily J. Eklund、Robert D. Pike、Anshul A. Mainkar、Jonathan R. Scheerer
DOI:10.1021/ol200155p
日期:2011.3.4
Loline alkaloids exhibit a strained ether-bridged pyrrolizidine skeleton and possess insecticidal and insect antifeedant properties. The synthesis of acetylnorloline, a prototypical member of the alkaloid family, is described. Central to the route is a stereoselective tethered aminohydroxylation (TA) of a homoallylic carbamate. Allylic (A1,3) strain is exploited to enforce diastereofacial selectivity during the aminohydroxylation.