Stereoselective synthesis of 4'-alpha-carbon-substituted nucleosides has been accomplished through epoxidation of 4',5'-unsaturatednucleosides with dimethyldioxirane (DMDO) and successive SnCl(4)-promoted ring opening of the resulting 4',5'-epoxynucleosides with organosilicon reagents. [reaction: see text]
Synthesis of 3′-deoxyadenosine-3′-spirocyclopropane, 3′-deoxy-uridine-3′-spirocyclopropane, and 5′-deoxy-4′,5′-methanoadenosine
作者:Vicente Samano、Morris J. Robins
DOI:10.1016/s0040-4039(00)73206-0
日期:1994.5
Cycloaddition of diazomethane with 3′-deoxy-3′-methylene- and 4′,5′-didehydro-5′-deoxynucleoside derivatives followed by sensitized photochemical extrusion of nitrogen provided the previously unreported 3′- and 4′-spirocyclopropane nucleoside derivatives. Enhancement of the cycloaddition reactions by electron withdrawing benzoyl protecting groups was observed.
A compound of Formula I, Formula II, Formula III, or Formula IV:
or a pharmaceutically acceptable salt, solvate, and/or ester thereof, therapeutic compositions containing such compounds, and therapeutic methods that include the administration of such compounds.
Sulfur Extrusion with Tin Radical: Synthesis of 4‘,5‘-Didehydro-5‘-deoxy-5‘-(tributylstannyl)adenosine, an Intermediate for Potential Inhibitors against <i>S</i>-Adenosyl Homocysteine Hydrolase
作者:Hiroki Kumamoto、Sayoko Onuma、Hiromichi Tanaka
DOI:10.1021/jo030256y
日期:2004.1.1
of vinyl fluoride. Because of the susceptibility of 12 to protodestannylation, the (Z)-vinyl iodide (13), prepared in quantitative yield from 12, was used as a substrate for C−C bond formation. Various types of carbon substituents (phenyl, vinyl, trifluorovinyl, ethynyl, and cyano) were introduced to the 5‘-position of the 5-deoxy-β-d-erythro-pent-4-enofuranosyl structure to open up a new route to