Total Synthesis of Bleomycin Group Antibiotics. Total Syntheses of Bleomycin Demethyl A<sub>2</sub>, Bleomycin A<sub>2</sub>, and Decarbamoyl Bleomycin Demethyl A<sub>2</sub>
作者:Kiyoaki Katano、Haoyun An、Yoshiaki Aoyagi、Mark Overhand、Steven J. Sucheck、William C. Stevens、Cynthia D. Hess、Xiang Zhou、Sidney M. Hecht
DOI:10.1021/ja9819458
日期:1998.11.1
versatile approach for the elaboration of a wide variety of BLM congeners. Bleomycin was constructed from five key intermediates, the syntheses of which are described. 1,6-Di-O-acetyl-3,4-di-O-benzyl-2-O-[2,4,6-tri-O-acetyl-3-O-(N-acetylcarbamoyl)-α-d-mannopyranosyl]-β-l-gulopyranose (3) was converted quantitatively to itsdisaccharide chloride (4), the latter of which was condensed with Nα,Nim-bis(t-Boc