Syntheses of hydantocidin and C-2-thioxohydantocidin
作者:Masao Shiozaki
DOI:10.1016/s0008-6215(02)00217-3
日期:2002.11
Hydantocidin (12), a naturally occurring strong herbicide, was synthesized in 35.2% overall yield, with accompanying 5-epi-hydantocidin (12') in 9.6% overall yield via isothiocyanate (13) and spiro-hydantoin (10) from 2,3-O-isopropylidene-D-ribono-1,4-lactone (1). C-2-thioxo-hydantocidin (24) was also synthesized in 16.5% overall yield with accompanying 5-epi-C-2-thioxohydantocidin (24', 9.2% yield)
Stereocontrolled synthesis of thiohydantoin spironucleosides from sugar spiroacetals
作者:José Fuentes、Bader A.B. Salameh、M. Angeles Pradera、Francisco J. Fernández de Córdoba、Consolación Gasch
DOI:10.1016/j.tet.2005.09.128
日期:2006.1
5-Epithiohydantocidin, N-alkyl and N-glycosylthiohydantoin spironucleosides are prepared from glycosylaminoesters and from furanoid and pyranoid methyl isothiocyanatoulosonates. The aminoesters; and the isothiocyanates are obtained, in a stereocontrolled manner, from sugar spiroacetals through a high-yielding sequence involving ring opening with trimethyl azide, formation of an ester group, reduction of the azide, and, in the case of isothiocyanates, reaction with thiophosgene. (c) 2005 Elsevier Ltd. All rights reserved.