The asymmetricsynthesis of novel cyclohexene nucleosideanalogues 12 and 15 is described. An enantiospecific Diels–Alder reaction between (E,E)-diene 2 and (+)-5-(d-mentyloxy)-2(5H)-furanone 3 provided the cycloadduct isomer 4. Three additional steps yielded amine 8 allowing the constructions of the thymine and adenine moieties to afford intermediates 11 and 14, respectively. Amination or cyclization
A Short Stereoselective Preparation of Dienamides from Cyclobutene Compounds. Application in the Synthesis of a New Cyclohexene Nucleoside
作者:Noëlle Gauvry、François Huet
DOI:10.1021/jo001467v
日期:2001.1.1
from 2-hydroxypyridine by a photochemical electrocyclic reaction. The tert-butoxycarbonyl derivative 17 was prepared to facilitate nucleophilic attacks to the carbonyl group, and the subsequent thermal ring opening provided dienes 18-21. One of these (20) was used in the synthesis of the cyclohexene nucleoside 30. A Diels-Alderreaction between diene 20 and maleic anhydride provided the endo-cycloadduct