Asymmetric total syntheses of elaeokanines A and B via .alpha.-sulfinyl ketimine

α-Lithiated (+)-(R)-4,5-dihydro-2-[[(4-methylphenyl)sulfinyl]methyl]-3H-pyrrole (4) underwent annulation with 1,3-diiodopropane to give (-)-(SS)-1,2,3,5,6,7-hexahydro-8-[(4-methylphenyl)sulfinyl]indolizine (6), which was converted into (-)-elaeokanine B (three steps) and (+)-elaeokanine A (four steps)