A Ready Entry to Substituted Derivatives of Pyrido[3",2":4',5']thieno[2',3':5,6]pyrido[2,3-d]pyrimidines, a New Tetraheterocyclic Ring System
✍ Scribed by Ojea, Vicente; Ma. Quintela, Jos�; Ma Quintela, Jos�; Peinador, Carlos; Carmen Veiga, Ma.
- Book ID
- 111865454
- Publisher
- Japan Institute of Heterocyclic Chemistry
- Year
- 1994
- Tongue
- English
- Weight
- 218 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0385-5414
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📜 SIMILAR VOLUMES
## Abstract For Abstract see ChemInform Abstract in Full Text.
## Abstract magnified image The thienopyridine derivative **2**, obtained from reaction of acetoacetic ester with **1** in the presence of tin tetrachloride, was treated with triphenylphosphine in hexachloroethane and Et~3~N to give iminophosphorane **3**. Iminophosphorane **3** reacted with pheny
## Abstract magnified image The cyclocondensation of 5‐hydroxy‐pyrido[2,3‐__d__]pyrimidines **1** with malonates gives pyrano[2′,3′:4,5]‐pyrido[2,3‐__d__]pyrimidines **2**. Nitration of **1** and reduction with zinc in the presence of carboxylic acids/anhydrides gave 2‐alkyloxazolo[5′,4′:4,5]pyrid