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2,6-Diaryl-4,4-disubstituted-4H-thiopyran: Source for spiro heterocycles

✍ Scribed by Venkatapuram Padmavathi; Akula Balaiah; Dandu Bhaskar Reddy

Publisher
Journal of Heterocyclic Chemistry
Year
2002
Tongue
English
Weight
63 KB
Volume
39
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

The 1,5‐diaryl‐3,3‐disubstituted‐1,5‐pentanedione on reaction with ammonium acetate, phosphorus pentoxide and phosphorus pentasulfide gave respective 1,4‐dihydropyridine, 4__H__‐pyran and 4__H__‐thiopyran. Novel spiro heterocycles have been obtained by the cyclocondensation of 4__H__‐thiopyran with hydrazine, hydroxylamine, urea and thiourea.

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2,6-Diaryl-4,4-disubstituted 1,4-dihydro
2,6-Diaryl-4,4-disubstituted 1,4-dihydropyridines: Source for spiro heterocycles
✍ V. Padmavathi; A. Balaiah; T. V. Ramana Reddy; B. Jagan Mohan Reddy; D. Bhaskar 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 86 KB 👁 1 views

## Abstract Novel spiro heterocycles (**__5–12__**) were obtained by the cyclocondensation of 2,6‐diaryl‐4,4‐dimethoxycarbonyl‐/4‐cyano‐4‐ethoxycarbonyl‐1,4‐dihydropyridines(**__3/4__**) with hydrazine hydrate, hydroxylamine hydrochloride, urea, and thiourea. All the compounds were characterized by

Gem-disubstituted 4-oxocyclohexanes: Sou
Gem-disubstituted 4-oxocyclohexanes: Source for spiro heterocycles
✍ Venkatapuram Padmavathi; Shaik Mahaboob Basha; Dandu Rangayapalle Chinna Venkata 📂 Article 📅 2005 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 166 KB

## Abstract Novel spiro heterocycles, substituted spiro‐pyrimidine, pyrazole and isoxazole compounds are prepared by the cyclocondensation of 4‐oxocyclohexane __gem__‐dicarboxylates and cyano esters with nucleophiles.