Chandra Kanta Ghosh

TL;DR: In this article, the chromone 2A (X = H(A), Me(B), Cl(C)) gives a mixture of the dihydropyridine 4A and pyranopyridine 15A, 2B gives 4B, and 2C gives varying amounts of the substituted enamine 3C, pyridone 4Cand benzophenone 8.

TL;DR: The pyridinium methylid (5), generated from 1-(4-oxo-4H-1-benzopyran-2-yl)methylpyrinium iodide (4) in the presence of a base, undergoes cycloaddition with dimethyl acetylenedicarboxylate and ethyl propiolate, thecycloadducts rapidly aromatising to the indolizines (8) and (9) respectively as discussed by the authors.

TL;DR: The title benzopyranones 1−3 gave the benzo[b]furan 7 and the benzos[b]-cyclopropa[e]pyrans 8 and 9 with chloroacetone in acetone containing anhydrous potassium carbonate and a catalytic amount of potassium iodide, respectively, but gave the 1-benzopyrans 10, 11 and 14 in dichloromethane in the presence of Brockman neutral alumina, respectively.

TL;DR: The publications on the title compound appearing mainly since 2007 to February 2014 are reviewed in this article, where the authors present a review of the most relevant publications on this title compound, mainly from 2007 to 2014.

TL;DR: The chromone 5, obtained by bromination of 3-acetyl-2-methylchromone (3), gives [1]benzoxepino[4,3-d]isoxazole (10) with hydroxylamine and phen... as mentioned in this paper.