Glycosylidene Carbenes. Part 20. Synthesis of deprotected, spiro-linkedC-glycosides of C60
作者:Peter Uhlmann、Eva Harth、Andrew B. Naughton、Andrea Vasella
DOI:10.1002/hlca.19940770820
日期:1994.12.14
Mannosylidenation of buckminsterfullerene (C60; 1) with the 2,3-di-O-benzyl-4,6-O-benzylidene-protected diazirine 7 and the 2,3:4,6-di-O-isopropylidene-protected diazirine 8 leads to the spiro-linked C -glycosides 6 and 10 in 44 and 31% yield, respectively (Scheme). The diazirine 8 was prepared in five steps from 2,3:4,6-di-O-iso-propylidene-α-D-mannopyranose (11) via the oximes 12, the (Z)-hydroximolactone