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Now showing items 1281-1288 of 1288

Facile Baylis-Hillman reaction of substituted 3-isoxazolecarbaldehydes: The impact of proximal heteroatom within a heterocycle on the acceleration of reaction

Roy, Amrendra K; Batra, Sanjay (2003)

The fast and facile Baylis-Hillman reaction in substi-tuted 3-isoxazolecarbaldehydes confirms the impact of the proxi-mal heteroatom within a heterocycle towards enhanced reactivity of the formyl group for this reaction
Studies on the Baylis-Hillman reaction of pyrazolecarbaldehydes under the influence of DABCO: Positional effect on the reactivity of the formyl group

Nag, Somnath; Singh, Virender; Batra, Sanjay (2007)

Results of the study to assess the difference in reactivity of the formyl group present at various positions in substituted pyrazolecarbaldehydes for the Baylis-Hillman reaction under the influence of DABCO are described.
Insights into the bromination of 3-aryl-5-methyl-isoxazole-4-carboxylate: Synthesis of 3-aryl-5-bromomethyl-isoxazole-4-carboxylate as precursor to 3-aryl-5-formyl-isoxazole-4-carboxylate

Roy, Amrendra K; Rajaraman, B; Batra, Sanjay (2004)

Results of the detailed investigations on the bromination of the methyl group of 3-aryl-5-methyl-isoxazole-4-carboxylate a precursor to obtain 3-aryl-5-formyl-isoxazole-4-carboxylate are described. The products generated ...
A regioselective palladium-free protocol for accessing unsymmetrical biaryls through ring transformation of 6-aryl-~-pyrones

Kumar, Amit; Singh, Fateh V; Goel, Atul (2007)

A regioselective synthesis of unsymmetrical biaryls with electron withdrawing or donating substituents is described and illustrated by carbanion-induced ring transfonnation of 6-aryl-a-pyrones with methoxyacetone in ...
Highly Substituted Isoxazoles: The Baylis-Hillman reaction of substituted 4-isoxazolecarbaldehydes and attempted cyclization to isoxazole-annulated derivatives

Roy, Amrendra K; Batra, Sanjay (2003)

In an attempt to understand the effect of position of the formyl group on the efficiency of Baylis-Hillman reaction within isoxazolecarboxaldehydes, the reactions of substituted 4-isoxazolecarboxaldehydes to obtain highly ...
New cassane butenolide hemiketal diterpenes from the marine creeper Caesalpinia honduc and their antiproliferative activity

Yadav, P P; Arora, Ashish; Bid, H K; Konwar, Rituraj; Kanojiya, Sanjeev (2007)

Two new cassane butenolides, caesalpinolide A (1) and B (2), epimeric at the hemiketal position were isolated from the marine creeper Caesalpinia bonduc. The structures were elucidated by the analysis of spectroscopic ...
Selective removal of anomeric O-acetate groups in carbohydrates using HCl04-Si02-tr

Tiwari, Pallavi; Misra, Anup Kumar (2006)

A convenient methodology has been developed for the selective removal of the anomeric acyl group of carbohydrate derivatives using HCI04-Si02 under acidic reaction conditions. Anomeric benzoyl groups can also be removed ...
Mild and efficient method for the cleavage of benzylidene acetals using HCl04-Si02 and directconversion of acetals to acetates

Agnihotri, Geetanjali; Misra, Anup Kumar (2006)

HCI04-Si02 has been used successfuIly for the deprotection of benzylidene acetals and the direct conversion of benzylidene acetals to the corresponding di-O-acetates. The reactions are very fast and yields are excellent

Now showing items 1281-1288 of 1288

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