Synthesis of Oxepane Ring Containing Monocyclic, Conformationally Restricted Bicyclic and Spirocyclic Nucleosides from <scp>d</scp>-Glucose: A Cycloaddition Approach
作者:Subhankar Tripathi、Biswajit G. Roy、Michael G. B. Drew、Basudeb Achari、Sukhendu B. Mandal
DOI:10.1021/jo070846m
日期:2007.9.1
C-3-O-allyl, (ii) C-4 vinyl and a C-3-O-tethered nitrone, and (iii) C-5 nitrone and C-4-allyloxymethyl generated tetracyclic isoxazolidinooxepane/-pyran ringsystems upon intramolecular nitrone cycloaddition reactions. Deprotection of the 1,2-acetonides of these derivatives followed by introduction of uracil base via Vorbrüggen reaction condition and cleavage of the isooxazolidine rings as well as of benzyl