Reactions of 4,5-dicyanopyridazine with alkynes and enamines: A new straightforward complementary route to 4-mono- and 4,5-disubstituted phthalonitriles
摘要:
The preparation of the 1,2-dicyanobenzenes 6a-m in fairly good to excellent yields by one-pot procedures based on [4+2] cycloaddition processes of the title compound 1 with acetylenic or enamine dienophiles, is reported; some features of this new synthetic strategy are emphasized. (C) 1998 Elsevier Science Ltd. All rights reserved.