One-pot synthesis of dihydropyrano[2,3-c]pyrazole derivatives using β-cyclodextrin-SO 3 H as a reusable catalyst in aqueous medium

Abstract: We have developed an expedient and highly efficient β-cyclodextrin-SO 3 H catalyzed approach for the eco-friendly synthesis of dihydropyrano[2,3-c]pyrazole derivatives in aqueous medium. The reaction proceeded smoothly with a range of functionalities within 15-30 min to produce the dihydropyrano[2,3-c]pyrazole scaffolds in good to excellent yields. β-cyclodextrin-SO 3 H can be recycled and reused with an insignificant loss of catalytic activity

Tannic Acid an Efficient Catalyst for the Synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one Derivatives

Tannic acid explore a highly efficient catalytic activity for the synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one derivatives in excellent yields via cyclocondensation of aromatic aldehyde, β-naphthol and dimedone. Catalyst having advantages such as it is cheap and biodegradable and the protocol avoids the use of expensive catalyst and toxic solvent. We believe that this methodology is an efficient, simple, highly yielding, time saving and environmentally friendly. DOI: http://dx.doi.org/10.17807/orbital.v7i2.68

Environmentally Benign Protocol for the Synthesis of 1,2-dihydro-1-aryl naph- tho [1,2-e] [1,3] oxazine-3-one Derivatives

Abstract: 1,2-dihydro-1-aryl naphtho [1,2-e] [1,3] oxazine-3-one derivatives have been synthesized via one-pot condensation of aromatic aldehyde, β-naphthol and urea using cellulose sulfuric acid (CSA) as catalyst in solvent free condition under microwave irradiation. CSA has efficiently catalyzed the cyclocondensation and enhanced the product yields by reducing reaction time. The uniqueness of CSA is that it is isolable after the reaction and reusable

A Green Approach to the Synthesis of 5-Arylidene-2,4-thiazolidinediones Using Aqueous SDS Micelle Catalysis

A Green Approach to the Synthesis of 5-Arylidene-2,4-thiazolidinediones Using Aqueous SDS Micelle Catalysi