The radical cascade cyclization of various 1,6-enynes with arylradicals by electron catalysis under metal-free reaction conditions was explored. Readily available anilines were used as radicalprecursors, and the reactions proceeded in the absence of any transition metal. These cascades comprise three C–C bond formations, which provide polycyclic structures with extended π-systems. The photophysical
General Synthetic Method for Naphthyridines and Their N-Oxides Containing Isoquinolinic Nitrogen
作者:Atsushi Numata、Yoshinori Kondo、Takao Sakamoto
DOI:10.1055/s-1999-3379
日期:1999.2
Substituted naphthyridines containing isoquinolinic nitrogen were synthesized by the reaction of o-ethynylpyridinecarbaldehydes with ammonia. The synthesis of their N-oxides was also achieved by a basic cyclization reaction of the same pyridine derivatives via the corresponding oximes.