A series of novel 3′-(alkyl(hydroxy)amino)-2′-fluoronucleoside analogs were prepared via conjugate addition of N-methylhydroxylamine to various 2-fluorobutenolides. The adducts 13a and 16 were obtained as single isomers under absolute control of stereochemistry. The crucial N-demethylation of 23–25 was readily achieved by means of DDQ oxidation, followed by nitrone/oxime exchange reaction. By this
Concerted Conjugate Addition of Nucleophiles to Alkenoates. 2. Synthesis of 2‘,3‘-Dideoxy-2‘-β-fluoro-3‘-(<i>N</i>-hydroxy-<i>N</i>- methylamino)-<scp>d</scp>-arabinofuranosyl Nucleosides
作者:Shifeng Pan、Jianwu Wang、Kang Zhao
DOI:10.1021/jo9815507
日期:1999.1.1
Stereoselective Synthesis of Carbocyclic <scp>l</scp>-4‘-Fluoro-2‘,3‘-dideoxyadenosine
作者:Giuseppe Gumina、Youhoon Chong、Yongseok Choi、Chung K. Chu
DOI:10.1021/ol005665k
日期:2000.5.1
L-(1'S,3'S)-9-[3-Fluoro-3-(hydroxymethyl)cyclopentan-1-yl]adenine 15 has been synthesized from ester 2, which can be conveniently prepared from 2,3-isopropylidene-D-glyceraldehyde 1 in six steps. The key ring closure has been accomplished through an intramolecular nucleophilic substitution reaction.