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A domino condensation-cyclization method is developed to synthesize indolizidine alkaloids using a P 4 O 10 /TfOH reagent system without the employment of either a catalyst or solvent. The use of a few aliphatic and aromatic dicarboxylic acids is shown along with various primary amines. This method is suitable for synthesizing pyrrolo[2,1- a ]isoquinolines, pyrido[2,1- a ]isoquinolines, and isoindolo[1,2- a ]isoquinolinones in excellent yields. When phthalic acid is used, a workup with either NaBH 4 or a saturated NaHCO 3 solution provided 12 b -H or 12 b -OH isoindolo[1,2- a ]isoquinolinones, respectively.

rsc advances

P<sub>4</sub>O<sub>10</sub>/TfOH mediated domino condensation–cyclization of amines with diacids: a route to indolizidine alkaloids under catalyst- and solvent-free conditions

P4O10/TfOH mediated domino condensation–cyclization of amines with diacids: a route to indolizidine alkaloids under catalyst- and solvent-free conditions

P₄O₁₀/TfOH mediated domino condensation–cyclization of amines with diacids: a route to indolizidine alkaloids under catalyst- and solvent-free conditions