Oxazoline <i>N</i>-Oxide Mediated [2 + 3] Cycloadditions. Application to a Formal Synthesis of (+)-Carpetimycin A
作者:M. Mauduit、C. Kouklovsky、Y. Langlois、C. Riche
DOI:10.1021/ol005596+
日期:2000.4.1
[formula: see text] Cycloaddition between gamma,delta-unsaturated beta-enamino ester 9 and camphor-derived oxazoline N-oxide 8 afforded a single adduct, 14. Dipolarophile 9 proved to be very reactive despite the substitution on the double bond. Stereoselective sodium cyanoborohydride reduction of the imminium intermediate 14a gave rise stereoselectively to beta-amino ester derivative 15a. Oxidative