Total synthesis of calicheamicin .gamma.1I. 3. The final stages
作者:K. C. Nicolaou、C. W. Hummel、M. Nakada、K. Shibayama、E. N. Pitsinos、H. Saimoto、Y. Mizuno、K. U. Baldenius、A. L. Smith
DOI:10.1021/ja00070a006
日期:1993.8
The first totalsynthesis of calicheamicin γ 1 I (1) has been achieved. The stereoselective glycosidation, joining the appropriately functionalized aglycon 3 with the oligosaccharide fragment 2, was realized uding Schmidt's trichloroacetimidate methodology. Segment 4, equipped with the photolabile 2-nitrobenzyl group at the reducing end, was synthesized using similar chemistry to that applied to the