Opening of 2',3'-O-anhydro-ring of 2',3'-O-anhydro-lyxo-uridine by alkyl- and arylamines. Easy syntheses and preparative uses of 2'-deoxy-2'-alkylamino-xylo- and 3'-deoxy-3'-alkylamino-ara-uridines
作者:Sanjib Bera、Tanmaya Pathak、Graham J. Langley
DOI:10.1016/0040-4020(94)01040-7
日期:1995.1
Contrary to the previous report (ref. 8), under controlled conditions alkylamines, both primary and secondary and arylamines, opened the epoxide ring of 1-(5-O-trityl-2,3-O-anhydro-β-D-lyxo-furanosyl)-uracil to produce 2'-deoxy-2'-alkylamino-xylo- and 3'-deoxy-3'-alkylamino-ara-uridines without causing any significant deglycosylation. To show the utility of these products, several modified uridine derivatives
Thermal degradation of sugar-modified uridine N-oxides: Olefination, oxazolidination and rearrangements
作者:Sanjib Bera、Tanmaya Pathak
DOI:10.1016/s0040-4020(99)00797-8
日期:1999.11
The degradation pattern of the N-oxides of various tertiary aminouridines is established. The N-oxide of 3′-deoxy-3′-morpholino-arauridine generated double bonds in the carbohydrate moiety without much selectivity, whereas epimino uridine N-oxides generated only d4U. Oxazolidine derivatives were formed from the N-oxides of 3′-deoxy-3′-N-pyrrolidino/morpholino-2,2′-O-anhydrouridines and 3′-deoxy-3′