Scheme 9. Application to Enantioselective Synthesis of Heliespirone A and Heliannuol E.
Reactions performed under N2 atm; conversion (allylic phosphate consumption), site selectivities, and diastereoselectivities (±2%) were determined by analysis of 400 MHz 1H NMR spectra of product mixtures prior to purification; yields (±5%) are of products after purification; enantioselectivities (±2%) were determined by HPLC analysis. See the Supporting Information for experimental and analytical details.