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1799821 
Journal Article 
Annulated heterocycles from methyl 6-chloro-5-formyl-2-methyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3-carboxylate 
Gorlitzer, K; Enge, C; Jones, PG 
2006 
Yes 
Die Pharmazie
ISSN: 0031-7144 
61 
1 
4-9 
German 
16454197 
WOS:000234698800002 
The pyridone 1a reacts with POCl3/DMF to yield the title compound 2a. After irradiation of 2a the enolether 3 is isolated, as shown by an X-ray structure determination. The pyridine 4 obtained by dehydrogenation of 2a leads under reductive conditions to the benzo[c][2,7]naphthyridines 5-7. The reaction of 4 with o-phenylenediamine gives the benzimidazole 8, while using 2-aminophenol or 2-aminothiophene respectively the pyrido[2,3-b[1,5]benzoxazepine 11 and the corresponding benzothiazepine 12 are obtained.