The kinetics of the reactions of different heterocyclic anions derived from imidazoles, purines, pyrimidines, and related compounds with benzhydrylium ions and structurally related quinone methides have been studied in DMSO and water. The second‐order rate constants (log k2) correlated linearly with the electrophilicity parameters E of the electrophiles according to the correlation log k2 = sN(N+E)
An Efficient Total Synthesis of Carbocyclic 2?-Deoxyribonucleosides
作者:Hanspeter Lang、Heinz E. Moser
DOI:10.1002/hlca.19940770608
日期:1994.9.21
purine and pyrimidine bases with the cyclopentane moiety via the cyclic sulfate (+)-19. This totalsynthesis of enantiomerically pure and racemic carbocyclic 2′-deoxyribonucleosides 1 represents one of the most efficient approaches reported to date. Starting from cyclopentadiene, the four carbocycles corresponding to the naturallyoccurring 2′-deoxyribonucleosides could be prepared in 12 steps and
The coupling reaction of the sodium salt of adenine, which could be easily prepared by deprotonation with sodium hydroxide or sodium methoxide, with 1-α-chloro-2-deoxyribose derivative proceeded in a good stereospecific manner in acetone as a solvent to give the β-anomer of the corresponding acylated adenosine.