Regioselectivity in the reaction of azinium salts and ylides with tetracyanoethylene
作者:A. M. Shestopalov、I. A. Aitov、Yu. A. Sharanin、V. P. Litvinov
DOI:10.1007/bf00961312
日期:1991.6
The reactions of pyridinium, picolinium, and quinolinium salts and ylides with tetracyanoethylene have been found to be regioselective. Reaction of azinium salts with tetracyanoethylene in aqueous methanol affords azinium tricyanoethylenolates, but pyridinium ylides react differently, with the highly stereoselective formation of the Z-isomers of 3-aroyl-3-(R-1-pyridinio)-1,1,2-tricyano-2-propen-1-ides, which are 1,4-ylides with maximum charge separation.
Regio- and stereoselectivity of the reactions of pyridinium and picolinium salts and ylids with nitriles containing a nucleofugic group
作者:A. M. Shestopalov、V. P. Litvinov、Yu. A. Sharanin、I. A. Aitov、L. A. Rodinovskaya
DOI:10.1007/bf00958584
日期:1991.4
The reaction of pyridinium, 2-picolinium, and 3-picolinium ylids with tetracyanoethylene, ethoxymethylenemalononitrile, and (dimethylthio)methylenecyanamide in the presence of organic bases proceeds regio- and stereo-selectively to give substituted pyridinium 1,4-ylids, 2-(2-propen-1-ylidene)-1,2-dihydropyridines, and 5-(1-pyridino)pyrimidin-4-olates, respectively. The reaction of 1-phenacylpyridinium bromide and tetracyanoethylene leads to 1-phenacylpyridinium tricyanoethenolate.
KATRITZKY A. R.; GRZESKOWIAK N. E.; ALVAREZ-BUILLA J., J. CHEM. SOC. PERKIN TRANS., PART 1, 1981, NO 4, 1180-1185
作者:KATRITZKY A. R.、 GRZESKOWIAK N. E.、 ALVAREZ-BUILLA J.
DOI:——
日期:——
ALVAREZ-BUILLA, J.;GONZALEZ, TRIGO, G.;EZQUERRA, J.;FOMBELLA, M. E., J. HETEROCYCL. CHEM., 1985, 22, N 3, 681-685
作者:ALVAREZ-BUILLA, J.、GONZALEZ, TRIGO, G.、EZQUERRA, J.、FOMBELLA, M. E.
DOI:——
日期:——
Preparation of tetrahydroindolizines from pyridinium and isoquinolinium ylides
作者:Alan R. Katritzky、Nicholas E. Grzeskowiak、Julio Alvarez-Builla
DOI:10.1039/p19810001180
日期:——
Carbonyl- and nitrile-stabilised pyridinium and cyclic azonium methylides condense with chalcones to form tetrahydroindolizines and analogous fused pyrrolidines. The stereochemistry is illuminated by 13C and 1H n.m.r. spectroscopy. Several incorrect literature structures are rectified.
羰基和腈稳定的吡啶鎓和环状的偶氮鎓甲基化物与查耳酮缩合,形成四氢吲哚并二苯并类似的稠合吡咯烷。立体化学由13 C和1 H nmr光谱照亮。纠正了一些错误的文献结构。