Concomitant Nitrene and Carbene Insertion Accompanying Ring Expansion: Spectroscopic, X-ray, and Computational Studies
作者:Divneet Kaur、Hoi L. Luk、William Coldren、Pavan M. Srinivas、Lakshetti Sridhar、Sripadi Prabhakar、Partha Raghunathan、T. N. Guru Row、Christopher M. Hadad、Matthew S. Platz、Sambasivan V. Eswaran
DOI:10.1021/jo402621w
日期:2014.2.7
Reinvestigation of the thermolysis of azido-meta-hemipinate (I) yielded, in addition to known II, unusual products III and IV. These products are formed via a rare intramolecular nitrene insertion into an adjacent methoxy C–H bond followed by an intermolecular reaction during a ring-expansion and a ring-extrusion reaction followed by a carbene insertion. The structures of the new compounds were confirmed
The unusual formation of methyl α-(5,6-dimethoxycarbonyl-2,3-dimethoxyazepin-7-ylidene)-α-[5-methoxycarbonyl-2,3-dimethoxypyrid-6-yl)acetate during the pyrolysis of “Azido-<i>meta</i>-hemipinate”: First example of a reaction involving a concomitant ring expansion and ring extrusion
作者:S. V. Eswaran、H. Y. Neela、S. Ramakumar、M. A. Viswamitra
DOI:10.1002/jhet.5570330454
日期:1996.7
exception in the ring closure reactions of ortho substituted aryl azides, as it provides no rate acceleration to this reaction. Pyrolysis of “azido-meta-hemipinate”, an aryl azide containing such a substituent, led us to the title compound, a new azepinylidene-pyridylacetic ester, whose structure has been established unambiguously by a single crystal X-ray diffraction study. This is the first report of a