TheSemmler-Wolffaromatization andSchmidtreaction applied to some pyrido2′,3′:3,4pyrazolo5,1-c1,2,4benzotriazines

摘要

Pyrido2′,3′:3,4pyrazolo5,1-c1,2,4benzotriazin-4(1H)ones were transformed via their oximes in aSemmler-Wolffaromatization process in the tetracyclic heteroaromatic amines4or bySchmidtreaction into a mixture of the same amine4and a ring enlarged lactam3. Syntheses of some halo pyrazolo3,4-bpyridines and a photochemical transformation of 3-azidopyrazolo3,4-bpyridine are also descri