Synthesis of cyclobutenes by the novel photochemical ring contraction of 4-substituted 2-amino-3, 5-dicyano-6-phenyl-4H-pyrans

D Armesto, WM Horspool, N Martin…

Index: Armesto, Diego; Horspool, William M.; Martin, Nazario; Ramos, Ana; Seoane, Carlos Journal of Organic Chemistry, 1989 , vol. 54, # 13 p. 3069 - 3072

Full Text: HTML

Citation Number: 187

Abstract

The identity of the nitrile 14 was readily established by its spectroscopic properties." The identification of enamide 15a was also readily carried out by spectroscopic methods and by comparison with data for the authentic material. 13 On the basis of the photochemistry of 4H- pyransw previously reported, there seemed to be only two possibilities for the structure of the product of photoisomerization. The di-a-methane reactivity, if it were to occur in 9a, could ...