boron triethoxide; (1R,2R,4aS,7R,8aR,9aS)-2-isopropenyl-1-isopropyl-4,4,7-trimethyldecahydro-9-oxa-3a-azacyclopenta[b]naphthalen-1-ol in toluene T=-35°C; 40.5 h; Inert atmosphere; optical yield given as percent eeenantioselective reaction;

1: DCC; DMAP View Scheme