Stereoselective formation of tetrahydrofurans during allyltrimethylsilane additions to L-xylose derivatives
作者:Ronald A. Veloo、Martin J. Wanner、Gerrit-Jan Koomen
DOI:10.1016/s0040-4020(01)89027-x
日期:——
Stereoselective addition reactions to the aldehyde function of some L-xylose derivatives, under the influence of Lewis acid catalysts, lead to the formation of tetrahydrofuran derivatives at low temperatures, depending on the acetal protecting groups used. Via separate reactions it was shown, that these tetrahydrofurans seemed to be intermediates in the formation of homoallyl alcohols.
Stereospecific synthesis of (+)- and (-)-sesbanimide A
作者:Martin J. Wanner、Nico P. Willard、Gerrit-Jan Koomen、Upendra K. Pandit
DOI:10.1016/s0040-4020(01)81662-8
日期:——
Starting from L-xylose and D-xylose derivatives, (-)-sesbanimide A and (+)-sesbanimide A, respectively, have been synthesized. The carbohydrate templates constitute ring B of the alkaloid on which the remaining two rings are constructed in the sequence B → AB → ABC.
Synthesis of the trioxadecalin-part of mycalamide B
作者:Reinhard W. Hoffmann、Achim Schlapbach
DOI:10.1016/s0040-4039(00)61506-x
日期:1993.12
A stereoselective synthesis of the trioxadecalin part of mycalamideB has been realized starting from 2,4,3,5-dimethylene-L-xylose. The C-10-aminal stereocenter is generated by a Curtius degradation.