816422-16-9

Upstream product

• 147235-54-9 diethyl 2,5-bis[(triphenyl-λ⁵-phosphanylidene)amino]thiophene-3,4-dicarboxylate 
• 80691-81-2 2,5-diamino-thiophene-3,4-dicarboxylic acid diethyl ester 
• 1027220-71-8 C₃₅H₃₀N₃O₄PS 

Downstream Products

• 1026504-38-0 6-(4-chloro-phenyliminomethyleneamino)-2-morpholin-4-yl-4-oxo-3-phenyl-3,4-dihydro-thieno[2,3-d]pyrimidine-5-carboxylic acid ethyl ester 
• 1026081-99-1 2-morpholin-4-yl-4-oxo-3-phenyl-6-phenyliminomethyleneamino-3,4-dihydro-thieno[2,3-d]pyrimidine-5-carboxylic acid ethyl ester 
• 1026525-62-1 2-morpholin-4-yl-4-oxo-3-phenyl-6-p-tolyliminomethyleneamino-3,4-dihydro-thieno[2,3-d]pyrimidine-5-carboxylic acid ethyl ester 

Relevant academic research and scientific papers

Application of bis(iminophosphorane) in heterocyclic synthesis: New entries to symmetrically or unsymmetrically substituted thieno[2,3-d:5,4-d′] dipyrimidine-4,5(3H,6H)-diones

The bis(carbodiimides) 4, obtained from bis-aza-Wittig reactions of bis(iminophosphorane) 3 with 2 equiv of aromatic isocyanates, were reacted with secondary amine to give symmetrically substituted 2,7-diaminothieno[2,3-d:5,4- d′]dipyrimidine-4,5(3H,6H)-d