Enantiomeric synthesis of polyhydroxylated indolizidine analogues related to castanospermine: 1-deoxy-7-epicastanospermine and 1,7-dideoxy-7-fluorocastanospermine
HENDRY, DAVID;HOUGH, LESLIE;RICHARDSON, ANTHONY C., TETRAHEDRON LETT., 28,(1987) N 39, 4597-4600
作者:HENDRY, DAVID、HOUGH, LESLIE、RICHARDSON, ANTHONY C.
DOI:——
日期:——
Enantiomeric synthesis of polyhydroxylated indolizidine analogues related to castanospermine: 1-deoxy-7-epicastanospermine and 1,7-dideoxy-7-fluorocastanospermine
作者:C.-Kuan Lee、K.Y. Sim、Jun Zhu
DOI:10.1016/s0040-4020(01)86601-1
日期:1992.9
(6S,7S,8R,8aR)-6,7,8-Trihydroxyindolizidine (1) and its (7R)-deoxyfluoro analogue (2) was synthesised from 5,8-benzyloxycarbonylimino-5,6,7,8-tetradeoxy-1,2-O-isopropylidene-alpha-D-gluco-octose (3). The key step is an oxidation-reduction sequence. Introduction of a fluoro substituent at C-3 (6) was readily effected by displacement of the 3-trifluoromethanesulfonyl (triflate) group with tris-(dimethylamino)-sulfonium-difluorotrimethylsilicate (TASF).