Thermal or Lewis acid-promoted electrocyclisation and hetero Diels–Alder cycloaddition of α,β-unsaturated (conjugated) carbodiimides: a facile synthesis of nitrogen-containing heterocycles
β-styrylcarbodiimide was entirely unreactive toward either the electrocyclisation or the Diels–Alderreaction even under severe reaction conditions. 4-Coumarylcarbodiimide underwent an inverse electron-demand Diels–Alderreaction with an enamine either thermally or in the presence of a Lewis acid catalyst to afford chromenopyridines. Thus experimentally observed reactivity differences of the substituted
ON THE REACTION OF<i>N</i>-VINYLIMINOPHOSPHORANES. A NOVEL ROUTE TO 1-AZAAZULENE RING SYSTEM UTILIZING AZA-WITTIG REACTION
作者:Makoto Nitta、Tomoshige Kobayashi
DOI:10.1246/cl.1986.463
日期:1986.4.5
phenylphosphorane, conveniently prepared from α-azidostyrene and triphenylphosphine, readily undergoes an annelation reaction with tropone derivatives to result in the formation of 1-azaazulene ringsystem.
On the reaction of (vinylimino)phosphoranes and related compounds. A short new synthesis of 5-azaazulene derivatives
作者:Makoto Nitta、Yukio Iino、Satoshi Mori
DOI:10.1016/s0040-4039(00)93587-1
日期:1991.11
The facile synthesis of phenyl-substituted and condenced 5-azaazulene ring systems was accomplished by the reaction of 2-formyl-6-dimethylaminofulvene with several phenyl-substituted (vinylimino)phosphoranes in one-flask operation.
Synthesis and structural studies of [n](2,4)pyridinophane ring system
作者:Nobuhiro Kanomata、Makoto Nitta
DOI:10.1016/s0040-4039(00)82239-x
日期:1988.1
The facile synthesis of [n](2,4)pyridinophane ring system (n = 9–6) was accomplished by the reaction of N-(1-phenylvinyl)iminophosphorane with cyclic α, β-unsaturated ketones. The chain flipping was studied by 1H NMR spectra at various temperatures.
[n](2,4)吡啶环体系(n = 9–6)的简便合成是通过N-(1-苯基乙烯基)亚氨基正膦与环状α,β-不饱和酮的反应完成的。通过在不同温度下的1 H NMR光谱研究了链翻转。
A Novel Route to Phenyl-substituted Pyridines by the Reaction of<i>N</i>-(1-Phenylvinyl)iminophosphoranes with α,β-Unsaturated Ketones
作者:Tomoshige Kobayashi、Makoto Nitta
DOI:10.1246/cl.1986.1549
日期:1986.9.5
The N-(1-phenylvinyl)iminotriphenylphosphorane or N-(1-phenylvinyl)iminotributylphosphorane reacted with α,β-unsaturated ketones to undergo a novel C–C bond formation followed by aza-Wittig reaction to result in the formation of phenyl-substituted pyridines.