Methyl 4,6-dichloro-3-diethylaminofuro[3,4-c]pyridine-1-car☐ylate: Synthesis of the first stable azaisobenzofuran by a Hamaguchi-Ibata reaction
作者:Tarun K. Sarkar、Sunil K. Ghosh、Sandip K. Nandy、Tahsin J. Chow
DOI:10.1016/s0040-4039(98)02414-9
日期:1999.1
The title compound, an intermediate in the Hamaguchi-Ibata reaction involving the Rh-II-catalysed intramolecular reaction of a diazo group with the carbonyl of an adjacent amido group has been isolated and characterized. PM3 calculations reveal the heat of formation(Delta H-f) of this remarkably stable molecule to be -77.69 kcal/mol. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
作者:T. K. Sarkar、S. K. Ghosh、G. D. Nigam、K. Chinnakali、H.-K. Fun
DOI:10.1107/s010827019900311x
日期:1999.7.15
The title compound, C19H22Cl2N2O7, has four independent molecules in the asymmetric unit with no pseudosymmetry. In each of the four molecules the fused cyclohexadiene ring adopts a skew-boat conformation, with two of the three methoxycarbonyl groups in the axial orientation and the third methoxycarbonyl and the diethylamino groups attached equatorially. The hydroxyl groups are involved in O-H ... O intermolecular hydrogen bonds with carbonyl-O atoms to form infinite chains in the [2 (1) over bar 0] direction.
Synthesis and Reactions of a Stable <i>o</i>-Quinoid 10-π-Electron System, Furo[3,4-<i>c</i>]pyridine
作者:Tarun K. Sarkar、Sunil K. Ghosh、Tahsin J. Chow
DOI:10.1021/jo991886w
日期:2000.5.1
4-c]pyridine-1-carboxylate (6), an intermediate in the Hamaguchi-Ibata reaction involving the Rh(II)-catalyzed intramolecularreaction of a diazo group with the carbonyl of an adjacent amido group, has been isolated and characterized. PM3 calculations reveal the heat of formation (DeltaH(f)) of this remarkably stable molecule to be -77.7 kcal/mol. Compound 6 undergoes a facile Diels-Alder cycloaddition with a variety