Synthesis of novel 3′-C-methyl-4′-thio apionucleosides via highly enantioselective elaboration of quaternary carbon by [3,3]-sigmatropic rearrangement
作者:Joon H. Hong、Mu-Yun Gao、Chung K. Chu
DOI:10.1016/s0040-4039(98)02324-7
日期:1999.1
Asymmetricsynthesis of 3′-C-methyl-4′-thio apionucleosides was accomplished from the chiral intermediate 6. The chirality of quaternary carbon of the key intermediate 6 was transferredfrom the chirality of secondary allylic alcohol 5via [3,3]-sigmatropic Claisen rearrangement with high enantiomeric excess (estimated to be 98.5% ee). The thioglycosyl intermediate 11 was condensed with silylated N4-benzoylcytosine