DBU catalyzed (3 + 3) annulation of β′ and δ-acetoxy allenoates with benzo-oxathiin-dioxide and phenylthiazolone: Synthesis of pyrano-oxathiines and pyrano-thiazoles
Asif Ali Qureshi, Sachin Chauhan, K C Kumara Swamy
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引用次数: 0
Abstract
Annulation reactions involving acetoxy allenoates and enolizable carbonyl substrates under DBU (DBU = 1,8-diazabicyclo[5.4.0]undec-7-ene) catalysis is described in this paper. Thus DBU catalyzed (3 + 3) annulation reactions of acetoxy allenoates with the bifunctional nucleophiles benzo-oxathiin-dioxide and phenylthiazolone afford fused 4H-pyrans. Both β′-acetoxy allenoates and δ-acetoxy allenoates undergo this annulation to give pyrano-oxathiines or pyrano-thiazoles.
Graphical abstract
Acetoxy allenoates undergo facile (3 + 3) annulation with benzo-oxathiin-dioxide and phenylthiazolone under DBU catalysis to afford pyrano-oxathiines and pyrano-thiazoles.
期刊介绍：
Journal of Chemical Sciences is a monthly journal published by the Indian Academy of Sciences. It formed part of the original Proceedings of the Indian Academy of Sciences – Part A, started by the Nobel Laureate Prof C V Raman in 1934, that was split in 1978 into three separate journals. It was renamed as Journal of Chemical Sciences in 2004. The journal publishes original research articles and rapid communications, covering all areas of chemical sciences. A significant feature of the journal is its special issues, brought out from time to time, devoted to conference symposia/proceedings in frontier areas of the subject, held not only in India but also in other countries.
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