O[C:2]1[CH:6]=[CH:5][S:4][CH:3]=1.[Cl:7][C:8]1[N:16]=[C:15]2[C:11]([NH:12][CH:13]=[N:14]2)=[C:10]([Cl:17])[N:9]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(OC(N=NC(OCC)=O)=O)C>O1CCCC1>[Cl:7][C:8]1[N:16]=[C:15]2[C:11]([N:12]=[CH:13][N:14]2[CH:2]2[CH2:6][CH2:5][S:4][CH2:3]2)=[C:10]([Cl:17])[N:9]=1312 mg of 3-hydroxythiophene, 380 mg of 2,6-dichloropurine, 6 ml of tetrahydrofuran, 786 mg of triphenylphosphine (P(phenyl)3) are mixed together at ambient temperature then 0.47 ml of DEAD (diethyl-azodicarboxylate) is added over 10 minutes and agitation is carried out overnight at ambient temperature. Then 10 ml of NaH2PO4 in aqueous solution 1M is added, followed by extracting 3 times with 10 ml of methylene chloride, washing with 10 ml of water with 5 of an aqueous solution of sodium chloride, drying and evaporating to dryness. After purification on silica eluting with methylene chloride/ethyl acetate in a proportion of 75/25 then 90/10, impasting is carried out at ambient temperature in 5 ml of isopropyl ether, followed by separating, washing with 5 ml of isopropyl ether and drying at ambient temperature. In this way 137 mg of expected product is obtained in the form of white crystals.
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