108311-18-8

Basic information

• Product Name: 2',3'-O-isopropylidene-5'-O-tosyltiazofurin
• Synonyms: 2',3'-O-isopropylidene-5'-O-tosyltiazofurin
• CAS NO: 108311-18-8
• Molecular Weight: 454.525
• Mol File: 108311-18-8.mol

Chemical Properties

• CAS DataBase Reference: 2',3'-O-isopropylidene-5'-O-tosyltiazofurin(CAS DataBase Reference)
• NIST Chemistry Reference: 2',3'-O-isopropylidene-5'-O-tosyltiazofurin(108311-18-8)
• EPA Substance Registry System: 2',3'-O-isopropylidene-5'-O-tosyltiazofurin(108311-18-8)

Safety Data

• Hazardous Substances Data: 108311-18-8(Hazardous Substances Data)

Upstream product

• 60084-11-9 2-(2',3'-O-isopropylidene-β-D-ribofuranosyl)thiazole-4-carboxamide 
• 98-59-9 p-toluenesulfonyl chloride 

Relevant articles and documents

Synthesis of thiazole-4-carboxamide-adenine difluoromethylenediphosphonates substituted with fluorine at C-2' of the adenosine

Synthesis of an analogue 3 of thiazole-4-carboxamide adenine-dinucleotide (TAD) in which the β-oxygen atom of the pyrophosphate bridge is replaced by a difluoromethylene group has been achieved. Likewise, 2'-deoxy-2'-fluoroadenosine containing analogues of TAD (4) and its difluoromethylenediphosphonate congener (5) have been synthesized. Adenosine 5'-difluoromethylenediphosphonate (8) was prepared from 5'-O-tosyladenosine (6) and tris(tetra-n-butylammonium)difluoromethylenediphosphonate (7) by a modified procedure of Poulter's. Compound 8 was converted into the 2',3'-cyclic carbonate 9 by treatment with triethyl orthoformate. Treatment of 9 with 2',3'-O-isopropylidenetiazofurin (10) in pyridine in the presence of DCC gave a mixture of dinucleotide 11 and the isopropylidene-protected diadenosine tetraphosphonate 12. After deprotection of 11, the desired β-difluoromethylene TAD (3) was separated by HPLC as the minor product. The diadenosine tetraphosphonate 12, an analogue of Ap4A, was obtained as the major component. Alternatively, 2',3'-O-isopropylidenetiazofurin (10) was tosylated, and the product 13 was further converted into the corresponding difluoromethylenediphosphonate 14 by coupling with 7. DCC-catalyzed coupling of 14 with 2'-deoxy-2'-fluoroadenosine (15) followed by deisopropylidenation afforded the analogue 5. Again the corresponding tetraphosphonate analogue of tiazofurin 17 was the predominant product. Dinucleotide 4 was obtained by coupling of the carbonyldiimidazole-activated tiazofurin 5'-monophosphate with 2'-deoxy-2'-fluoroadenosine 5'-monophosphate. 2'-Deoxy-2'-fluoroadenosine (15) was prepared efficiently from the known N6-benzoyl-3'-O-tetrahydropyranyladenosine (18), which was converted into 3'-O-tetrahydropyranyl-2'-O-triflyl-5'-O-trityladenosine (20) by tritylation and triflation. Treatment of 20 with sodium acetate in hexamethylphosphoric triamide, followed by deacetylation afforded 9-(3-O-tetrahydropyranyl-5-O-trityl-β-D-arabinofuranosyl)-N6-benzoyl adenine (22), which was then treated with DAST. After deprotection of the product, 15 was obtained in good yield. Synthesis of an analogue 3 of thiazole-4-carboxamide adenine-dinucleotide (TAD) in which the B-oxygen atom of the pyrophosphate bridge is replaced by a difluoromethylene group has been achieved. Likewise, 2'-deoxy-2'-fluoroadenosine containing analogues of TAD (4) and its difluoromethylenediphosphonate congener (5) have been synthesized.