Synthesis of Some Fully 3′ and 4′-C-Branched-Chain Sugar Nucleoside Analogues
摘要:
The synthesis of some new 3'-azido-3'-C-substituted pyrimidine nucleoside analogues is described. The key step is the geminal disubstitution of an appropriated ketone carbohydrate, via the regioselective ring opening of the corresponding tosyl-epoxide derivative.
Diastereoselective Weitz-Scheffer epoxidation of levoglucosenone for the synthesis of isolevoglucosenone and derivatives
作者:Edward T. Ledingham、Ben W. Greatrex
DOI:10.1016/j.tet.2018.08.041
日期:2018.10
High-yielding epoxidation conditions for the cellulose pyrolysis product (−)-levoglucosenone (LGO) and 3-aryl derivatives of LGO have been developed. The reaction of LGO with hydrogen peroxide/base is known to give a Baeyer-Villiger reaction, however, it was found that the reactions of LGO or derivatives with tert-butylhydroperoxide/base affords solely epoxides through the Weitz-Scheffer reaction.