Transition Metal-Mediated Syntheses of Yohimbane and Indolizidine Alkaloids. Iron-Mediated [2+2+1] Cycloaddition for the Syntheses of Indole Alkaloids: Total syntheses of Alloyohimbane and 3-Epialloyohimbane; Formal synthesis of Rauniticine and syntheses of various substituted nor-yohimbane alkaloids; Efficient total synthesis of demethoxycarbonyldihydrogambirtannine. Silver(I)-promoted Syntheses of Pyrroles: A novel silver(I)-promoted oxidative cyclization methodology for the synthesis of substituted pyrroles; Total synthesis of Harmicine, and Crispine A.