摘要通过碱催化添加2,3:5,6-二-O-异亚丙基-β-d-制备了一种新的支链醛糖2-C-(羟甲基)-d-阿洛糖(3)。将四呋喃糖合成为甲醛,然后将羟醛产物进行酸水解。在90°C下用催化量的钼酸处理时,3产生的平衡混合物为七庚二糖互变异构体和脱水形式,比例为12:1。通过用0.5MH 2 SO 4处理并结晶(总产率为63%),从该混合物中获得2,7-脱水形式的七庚糖,2,7-脱水-β-d-α-庚庚糖。
Reactions of 2,3-O-isopropylidene derivatives of furanose sugars with organomagnesium and organolithium, nucleophiles
作者:Boualem Mekki、Gurdial Singh、Richard H. Wightman
DOI:10.1016/s0040-4039(00)93450-6
日期:1991.9
Reactions of 2,3-O-isopropylidene derivatives of furanosesugars with Grignard reagents afford stereoselectively products with an anti- (erythro-) relationship between the new chiral centre and that at C-2; the corresponding reactions with organolithium reagents are more variable stereochemically, but some predictive guidelines can be established.
Buchanan, J. Grant; Lumbard, Keith W.; Sturgeon, Robert J., Journal of the Chemical Society. Perkin transactions I, 1990, p. 699 - 706
作者:Buchanan, J. Grant、Lumbard, Keith W.、Sturgeon, Robert J.、Thompson, Deryk K.
DOI:——
日期:——
New convenient synthesis of tunicamine
作者:Jan Ramza、Aleksander Zamojski
DOI:10.1016/s0040-4020(01)89859-8
日期:1992.1
A synthesis of tunicamine, the eleven-carbon atom sugar component of tunicamycin antibiotics, was described. The synthesis started from a derivative of 2-azido-2-deoxy-D-galactose (11) which was condensed with a furfuryl alcohol moiety. Achmatowicz-type transformation of this moiety to allofuranose system yielded a derivative of tunicamine. The synthesis required 11 steps and yielded 27 in 5.4% yield (from 11) and with good stereoselectivity.
Hydroxylated pyrrolidines. Synthesis of 1,4-dideoxy-1,4-imino-L-lyxitol, 1,4,5-trideoxy-1,4-imino-D- and -L-lyxo-hexitol, 2,3,6-trideoxy-3,6-imino-D-glycero-L-altro- and -D-glycero-L-galacto-octitols, and of a chiral potential precursor of carbapenem systems
作者:Deryk K. Thompson、Christine N. Hubert、Richard H. Wightman
DOI:10.1016/s0040-4020(01)90234-0
日期:1993.4
Enantiospecific syntheses are reported for the title pyrrolidines, from carbohydrate precursors. An intermediate in one of the routes, ethyl 2,3,6-trideoxy-3,6-imino-4,5:7,8-di-O-isopropylidene-D-glycero-L-altro-octonate (23), could be converted in two steps into a beta-lactam.