Subincanadines A−C, Novel Quaternary Indole Alkaloids from <i>Aspidosperma </i><i>s</i><i>ubincanum</i>

Three novel quaternary indole alkaloids with an unprecedented 1-azoniatricyclo[4.3.3.0<sup>1,5</sup>]undecane moiety, subincanadines A−C (<b>1</b><b>−</b><b>3</b>), as well as two new indole alkaloids with a 1-azabicyclo[5.2.2]undecane moiety, subincanadines D (<b>4</b>) and E (<b>5</b>), and a new indole alkaloid with a 1-azabicyclo[4.3.1]decane moiety, subincanadine F (<b>6</b>), have been isolated from the barks of <i>Aspidosperma subincanum</i> Mart, and the structures of <b>1</b><b>−</b><b>6</b> and the stereochemistry of <b>1</b><b>−</b><b>3</b> were elucidated by spectroscopic data and chemical means.