Synthesis and ring transformation of novel tetracyclic fused as-triazines
摘要:
Eight new tetracyclic fused as-triazines (4 - 6, 8, 11 - 13, and 15) have been synthesized by conversion and subsequent ring transformation of 1,2-diaminoisoquinolinium (2) and -quinolinium salts (9) with 4-benzoyl-5-phenylfuran-2,3-dione (1). Selective alkylations of the new products revealed that these reactions are governed mainly by the electronic density of the lone pairs as well as by steric effects.