Pyrid indazoles

A number of reports detailing the preparation of novel fused thiophenes have appeared including tetrahydrobenzothieno[2,3- /]imidazole 226 , dihydrothieno[3,2-g]indazole 227 and dihydrothieno[3,2-AJquinazoline 228 , benzothieno[2,3-Z7]pyridine 229 , thieno[2,3-f ]thiadiazine 230 , thieno[5,6-fc]thiazin-4-one 231 , tetrahydrothieno[3,4-c]pyrid-4-one 232 , and dihydrothieno[4,3,2- /][1.4]benzoxazepine 233 . 

Pyrid[l,2-b]indazoles 20, 215s31 Pyridine s. a. under Sodium hydroxide... 

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