Sulphamic acid: An efficient, cost-effective and recyclable solid acid catalyst for three-component synthesis of homoallylic amines

Homoallylic amines are synthesized by the three-component coupling reaction of aldehydes, anilines and allyltributylstannane using heterogeneous solid acid catalyst, sulphamic acid under solvent-free conditions in excellent yields. The catalyst can be recovered by simple filtration and can be recycled in subsequent reactions. The method is simple, cost-effective and environmentally benign.