V. S. Sadavarte

Reduction of sulfur with borohydride exchange resin in methanol: application to rapid and selective synthesis of disulfides

Abstract A convenient and rapid method for the synthesis of symmetrical disulfides from alkyl or aryl alkyl halides using sulfurated borohydride exchange resin (SBER) under anhydrous conditions is described. Selective transfer of sulfur to an alkyl group rather than an aryl group is achieved using this methodology.

An expedient and highly selective iodination of alcohols using a KI/BF3·Et2O system

Alkyl iodides are prepared in high yields by treatment of allylic and benzylic alcohols with an equimolar amount of KI in the presence of BF3·Et2O in dioxane under mild conditions.

Montmorillonite K-10 catalyzed synthesis of β-keto esters: condensation of ethyl diazoacetate with aldehydes under mild conditions

A simple and efficient synthesis of β-keto esters using montmorillonite K-10 catalyzed condensation of ethyl diazoacetate with various aldehydes at room temperature is described.

A mild procedure for rapid and selective deprotection of aryl acetates using natural kaolinitic clay as a reusable catalyst

Abstract A variety of aryl acetates are selectively cleaved to the corresponding phenols using natural kaolinitic clay in methanol under mild conditions (25°C).

Envirocat EPZG and natural clay as efficient catalystsfor transesterification of β-keto esters

Ethyl/methyl β-keto esters react with various alcohols in the presence of a catalytic amount of Envirocat EPZG or natural clay and undergo transesterification effectively.

Lithium perchlorate and lithium bromide catalysed solvent free one pot rapid synthesis of 3-carboxycoumarins under microwave irradiation

Reaction of 2-hydroxy or 2-methoxy substituted benzaldehydes or acetophenones with Meldrums acid in the presence of a catalytic amount of LiClO4 or LiBr without solvent under microwave irradiation afforded 3-carboxycoumarins in excellent yields.

Facile Tetrahydropyranylation of Alcohols and Phenols Using Anhydrous Calcium Chloride under Mild and Neutral Conditions

Summary. Treatment of 3,4-dihydro-2H-pyran with various alcohols and phenols in the presence of a catalytic amount of anhydrous calcium chloride in dichloromethane furnished tetrahydropyranyl ethers under almost neutral conditions.

Facile and selective deprotection of aryl acetates using sodium perborate under mild and neutral conditions

A variety of aryl acetates are cleaved to the corresponding phenols using sodium perborate in methanol under mild conditions (25 °C). The effectiveness of this protocol is manifested in its tolerance of different functional groups and selectivity of deprotection towards aryl acetates whereas alkyl acetates are found to be unreactive under these reaction conditions.

Chemoselective Preparation of Oximes, Semicarbazones, and Tosylhydrazoneswithout Catalyst and Solvent

Summary. A simple and versatile method for the synthesis of oximes, semicarbazones, and tosylhydrazones of aldehydes in the presence of ketones without catalyst and solvent is presented.

Zn mediated transesterification of β-ketoesters

Methyl/ethyl β-ketoesters when treated with various alcohols along with catalytic amount of Zn dust in refluxing toluene undergo smooth transesterification.