Convergent total synthesis of vineomycinone B2 methyl ester and its C(12)-epimer
摘要:
Total syntheses of vineomycinone B2 methyl ester (7) and its C(12)-epimer (epi-7) have been completed. The key reaction for construction of the aryl C-glycoside linkage is the O --> C-glycoside rearrangement starting from D-olivosyl fluoride derivative 11 and anthrol derivative 21, which provides the regio- and stereocontrolled formation of the aryl C-glycoside sector of the target. The combination of Cp2HfCl2-AgClO4 serves as a particularly efficient promoter for this reaction. An extensive model study for attaching the side chain is presented. The Lochmann-Schlosser base cleanly effects ortho metalation of anthracene derivatives 19 and 20. The metalated species can be trapped as stannyl derivatives, from which the corresponding aryllithium species are generated by using n-BuLi or preferably MeLi in toluene. These specific reaction conditions are necessary to suppress the abnormal reaction of RLi reagents at the C(9)/C(10)-positions of the anthracenes. Coupling of the side chain moiety was efficiently carried out by such metalation of anthracene derivative 25 followed by reaction with chiral aldehyde (S)-29. The chiral aldehyde was derived from enantiomerically pure acid (S)-37 obtained by enzymatic kinetic resolution. Deoxygenation of the benzylic alcohol function followed by several steps allowed the total ynthesis of 7. Starting from (R)-aldehyde 29, the same sequence of reactions accomplished the total synthesis of epi-7. The epi series of intermediates provided firm evidence for the stereochemical homogeneity of synthetic 7.
Stereocontrolled halofluorination of glycals with silicon tetrafluoride, leading to a facile synthesis of glycosyl fluorides
作者:Makoto Shimizu、Yuko Nakahara、Hirosuke Yoshioka
DOI:10.1016/s0022-1139(99)00026-3
日期:1999.7
Bromofluorination of glycals was carried out with SiF4, 1,3-dibromo-5,5-dimethylhydantoin (DBH), and H2O in 1,4-dioxane in the presence of HMPA to give bromofluoro sugars in good yields with good selectivities. Subsequent debromination with n-Bu3SnH gave 2-deoxy sugars in good yields. Furthermore, hydroxyfluorination of glycal was also successfully conducted using SiF4-PhI(OAc)2-H2O to give fluoroglucose