Improved and Efficient Synthesis of Pyrrolo[2,3,4-kl]acridin-1-one Derivatives under Ultrasound Irradiation

Single step incorporation of isatin to enaminone: a recyclable catalyst towards assembly of diverse four ring fused pyrrolo[2,3,4-kl]acridin-1-ones

Single step synthesis of four ring fused pyrrolo[2,3,4-kl]acridin-1-ones using recoverable sulfonated carbonaceous material as heterogeneous catalyst.