The stereocontrolledsynthesis of a racemic carboxylic acid of crambescin B, a marine alkaloid, is described. The synthesis features two highly stereoselective reactions: (i) palladium-catalyzed hydroxymethylation of an alkynyl aziridine having an N-guanidino group and (ii) cascade bromocyclization providing a spiro-hemiaminal structure. The cell-based colorimetric assay showed that the synthesized