Synthesis of 8‐amino‐4‐methylthio‐6‐methyl‐2‐(β‐D‐ribofuranosyl)‐2,6‐dihydro‐1,2,3,5,6,7‐hexaazaacenaphthylene and an unusual reductive ring‐opening of the 1,2,3,5,6,7‐hexaazaacenaphthylene ring system
dc.contributor.author | Kawasaki, Andrew M. | en_US |
dc.contributor.author | Townsend, Leroy B. | en_US |
dc.date.accessioned | 2013-02-12T19:00:23Z | |
dc.date.available | 2013-02-12T19:00:23Z | |
dc.date.issued | 1991-01 | en_US |
dc.identifier.citation | Kawasaki, Andrew M.; Townsend, Leroy B. (1991). "Synthesis of 8‐amino‐4‐methylthio‐6‐methyl‐2‐(β‐D‐ribofuranosyl)‐2,6‐dihydro‐1,2,3,5,6,7‐hexaazaacenaphthylene and an unusual reductive ring‐opening of the 1,2,3,5,6,7‐hexaazaacenaphthylene ring system." Journal of Heterocyclic Chemistry 28(1): 1-5. <http://hdl.handle.net/2027.42/96251> | en_US |
dc.identifier.issn | 0022-152X | en_US |
dc.identifier.issn | 1943-5193 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/96251 | |
dc.description.abstract | The tricyclic nucleoside 8‐amino‐4‐methylthio‐6‐methyl‐2‐(β‐D‐ribofuranosyl)‐1,2,3,5,6,7‐hexaazaacenaphthylene ( 3 ) was synthesized from 3‐cyano‐4,6‐ bis (methylthio)‐1‐(β‐D‐ribofuranosyl)pyrazolo[3,4‐ d ]pyrimidine ( 1 ). Attempts to synthesize 8‐amino‐6‐methyl‐2‐(β‐D‐ribofuranosyl)‐1 H ‐2,6‐dihydro‐1,2,3,5,6,7‐hexaazaacenaphthylene ( 5 ) ([an aza analog of 6‐amino‐4‐methyl‐8‐(β‐D‐ribofuranosyl)‐1,3,4,5,8‐pentaazaacenaphthylene (TCN)], which is a potent antitumor agent), by the treatment of 3 with Raney nickel did not afford the desired aza analog of TCN. Instead, it was established that a reductive cleavage of the pyridazine moiety of 3 had occurred to give 4‐methylamino‐6‐methylthio‐1‐(β‐D‐ribofuranosyl)‐1 H ‐pyrazolo[3,4‐ d ]pyrimidine‐3‐carboxamidine ( 6 ). Assuming that solubility was a problem in the reductive step, the isopropylidene derivative of 3 , 8‐amino‐6‐methyl‐4‐methylthio‐2‐(2,3‐ O ‐isopropylidene‐β‐D‐ribofuranosyl)‐2,6‐dihydro‐1,2,3,5,6,7‐hexaazaacenaphthylene ( 8 ), was treated with Raney nickel, only to observe that a similar reductive ring cleavage of 8 had occurred to afford 4‐methylamino‐6‐methylthio‐1‐(2,3‐ O ‐isopropylidene‐β‐D‐ribofuranosyl)‐1 H ‐pyrazolo[3,4‐ d ]pyrimidine‐3‐carboxamidine ( 10 ) and 4‐methylamino‐1‐(2,3‐ O ‐isopropylidene‐β‐D‐ribofuranosyl)‐1 H ‐pyrazolo[3,4‐ d ]pyrimidine‐3‐carboxamidine ( 11 ). Structural assignments for all products were established by physico‐chemical procedures. | en_US |
dc.publisher | Wiley‐Blackwell | en_US |
dc.title | Synthesis of 8‐amino‐4‐methylthio‐6‐methyl‐2‐(β‐D‐ribofuranosyl)‐2,6‐dihydro‐1,2,3,5,6,7‐hexaazaacenaphthylene and an unusual reductive ring‐opening of the 1,2,3,5,6,7‐hexaazaacenaphthylene ring system | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Organic Chemistry | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Medicinal Chemistry, College of Pharmacy, and Department of Chemistry, College of Literature, Sciences and and Arts, The University of Michigan, Ann Arbor, MI 48109‐1065 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/96251/1/5570280101_ftp.pdf | |
dc.identifier.doi | 10.1002/jhet.5570280101 | en_US |
dc.identifier.source | Journal of Heterocyclic Chemistry | en_US |
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dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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