摘要:
4-N-(Methylformamido)pyridine with (COCl)(2) gives the corresponding Vilsmeier reagent which reacts with 4-substituted dimethylanilines to produce 5-substituted-N-methylisatins. The corresponding 2-N-(methylformamido)pyridine under the same conditions generates benzo[2,3]pyrido[6,7-b][1,5]diazocines. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.