Shubhada W. Dantale

Use of solid superacid (sulphated SnO2) as efficient catalyst in tacile transesterification of ketoesters

Facile one to one transesterification of ketoesters catalysed by solid superacid (sulphated SnO2) is described.

INTERCONVERSION OF OXATHIOLANES AND CARBONYLS UNDER ESSENTIALLY IDENTICAL CONDITIONS

Abstract A catalytic, non-aqueous protocol for the interconversion of oxathiolanes and carbonyl compounds at room temperature is described.

An Efficient Oxidation of 1,4-Dihydropyridines Using Aqueous tert.-Butylhydroperoxide

Abstract Aromatization of 4-substituted 1,4-dihydro-2,6-dimethyl-3,5-pyridine dicarboxylate using aqueous tert.-butylhydroperoxide in 74–87% yield has been achieved.

TRANSESTERIFICATION OF KETOESTERS USING AMBERLYST-15

A facile one-to-one transesterification of ketoesters by Amberlyst-15 is described.

Facile deprotection of allyl esters mediated by solid superacid (sulphated SnO2)

Abstract Facile deprotection of allyl esters in the presence of sulphated SnO2 is described.

An efficient synthesis of α-Cuparenone

Abstract Synthesis of α-Cuparenone is described. The key step involved arephotorearrangement of α-halo arylketone (4) to 1-methyl-1-(p-tolyl)acetic acid (5) and extremely mild, essentially neutral, room temperature /3-aza-claisen reaction of N-allylamide (6).

MgBr2‐Mediated Ionic Diels–Alder Reaction of Acetals of α,β‐Unsaturated Aldehydes and Ketones with 1,3‐Dienes

Abstract A facile, mild, and efficient methodology for the ionic Diels–Alder reaction of acetals of α,β‐unsaturated ketones and aldehydes as dienophiles with various 1,3‐dienes employing MgBr2 as the Lewis acid catalyst to furnish corresponding Diels–Alder adducts at ambient temperature is described.

Unusually facile oxathioacetal transfer reaction: an efficient, highly selective catalytic deprotection protocol

CF3SO3SiMe3-catalysed one-to-one exchange of oxathioacetals to carbonyl compounds in the presence of 4-nitrobenzaldehyde is performed efficiently at room temperature, the protocol developed provided selective and effective deprotection of oxathiolanes in the presence of thioacetals.