L-Isonucleosides 17 and 19 were stereoselectively synthesised from (S)-glycidol by two different procedures. The key step was the synthesis of a chiral dihydrofuran which was carried out by oxidation/elimination of 8 and by ring-closing metathesis of diene 10. The procedure can be applied to the synthesis of both enantiomers. (C) 2003 Elsevier Science Ltd. All rights reserved.
An Expeditious and Efficient Procedure for the Synthesis of Unsaturated Acyclonucleosides of Z Configuration Related to D4T
摘要:
Enantiopure 2,5-dihydrofuran derivatives were prepared from (S)-glycidol through a new reaction sequence involving epoxide opening with a vinyleuprate, selenium-induced cyclization to give exclusively the 5-endo product, and regioselective selenoxide elimination. Unsaturated acy-clonucleosides of Z configuration were obtained in a straightforward manner by treating 2,5-dihydrofuran with iodotrimethylsilane in the presence of silylated purinic or pyrimidinic bases. This synthetic process involves opening of the dihydrofuran ring by trimethylsilyl iodide and substitution of iodine by the nucleic base in a single reaction step.
L-Isonucleosides 17 and 19 were stereoselectively synthesised from (S)-glycidol by two different procedures. The key step was the synthesis of a chiral dihydrofuran which was carried out by oxidation/elimination of 8 and by ring-closing metathesis of diene 10. The procedure can be applied to the synthesis of both enantiomers. (C) 2003 Elsevier Science Ltd. All rights reserved.
An Expeditious and Efficient Procedure for the Synthesis of Unsaturated Acyclonucleosides of <i>Z</i> Configuration Related to D4T
作者:Fernando Bravo、Antonio Viso、Sergio Castillón
DOI:10.1021/jo010948r
日期:2003.2.1
Enantiopure 2,5-dihydrofuran derivatives were prepared from (S)-glycidol through a new reaction sequence involving epoxide opening with a vinyleuprate, selenium-induced cyclization to give exclusively the 5-endo product, and regioselective selenoxide elimination. Unsaturated acy-clonucleosides of Z configuration were obtained in a straightforward manner by treating 2,5-dihydrofuran with iodotrimethylsilane in the presence of silylated purinic or pyrimidinic bases. This synthetic process involves opening of the dihydrofuran ring by trimethylsilyl iodide and substitution of iodine by the nucleic base in a single reaction step.