title: Syntheses of puromycin from adenosine and 7-deazapuromycin from tubercidin, and biological comparisons of the 7-aza/deaza pair.
abstract: Protection (O5') of 2',3'-anhydroadenosine with tert-butyldiphenylsilyl chloride and epoxide opening with dimethylboron bromide gave the 3'-bromo-3'-deoxy xylo isomer which was treated with benzylisocyanate to give the 2'-O-(N-benzylcarbamoyl) derivative. Ring closure gave the oxazolidinone, and successive deprotection concluded an efficient route to 3'-amino-3'-deoxyadenosine. Analogous treatment of the antibiotic tubercidin [7-deazaadenosine; 4-amino-7-(beta-D-ribofuranosyl)pyrrolo[2,3-d]pyrimidine] gave 3'-amino-3'-deoxytubercidin. Trifluoroacetylation of the 3'-amino function, elaboration of the heterocyclic amino group into a (1,2,4-triazol-4-yl) ring with N,N'-bis[(dimethylamino)methylene]hydrazine, and nucleophilic aromatic substitution with dimethylamine gave puromycin aminonucleoside [9-(3-amino-3-deoxy-beta-D-ribofuranosyl)-6-(dimethylamino)purine] and its 7-deaza analogue. Aminoacylation [BOC-(4-methoxy-L-phenylalanine)] and deprotection gave puromycin and 7-deazapuromycin. Most reactions gave high yields at or below ambient temperature. Equivalent inhibition of protein biosynthesis in a rabbit reticulocyte system and parallel growth inhibition of several bacteria were observed with the 7-aza/deaza pair. Replacement of N7 in the purine ring of puromycin by "CH" has no apparent effect on biological activity.
authors.affiliation: Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602-5700, USA. morris_robins@byu.edu
authors.forename: M J
authors.initials: MJ
authors.lastname: Robins
authors.forename: R W
authors.initials: RW
authors.lastname: Miles
authors.forename: M C
authors.initials: MC
authors.lastname: Samano
authors.forename: R L
authors.initials: RL
authors.lastname: Kaspar
mesh_terms: D000241:Adenosine / Q000737:chemistry; D000903:Antibiotics, Antineoplastic / Q000138:chemical synthesis*; D000964:Antimetabolites, Antineoplastic / Q000737:chemistry; D002474:Cell-Free System; D004355:Drug Stability; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D014176:Protein Biosynthesis / Q000187:drug effects; D011691:Puromycin / Q000138:chemical synthesis*; D014372:Tubercidin / Q000737:chemistry
chemical_list: D000903:Antibiotics, Antineoplastic; D000964:Antimetabolites, Antineoplastic; D011691:Puromycin; D000241:Adenosine; D014372:Tubercidin