The combination of hydrogen fluoride salt and aluminium fluoride: an efficient solid reagent for epoxide opening to give fluorohydrins
作者:Junko Ichihara、Terukiyo Hanafusa
DOI:10.1039/c39890001848
日期:——
The combination of hydrogenfluoridesalt and porous aluminiumfluoride (MHF2–AlF3)(M = alkali metal) is a stable and efficientsolidreagent for promoting the ring-opening reaction of simple aliphatic oxiranes to give the fluorohydrins under sonication, as a substitute for anhydrous hydrogenfluoride.
Regioselective Synthesis ofFluorohydrines via S<sub>N</sub>2-Type Ring-Opening of Epoxideswith TBABF-KHF<sub>2</sub>
作者:Shoji Hara、Yuriko Akiyama、Tsuyoshi Fukuhara
DOI:10.1055/s-2003-40865
日期:——
We found that the ring-opening fluorination of terminal epoxides using TBABF-KHF2 proceeds with high selectivity through the SN2 mechanism. As TBABF-KHF2 is easily obtainable, is stable, and can be used in glassware, it can be a useful reagent for 1-fluoro-2-alkanol synthesis from the terminal epoxides.
A compound having a non-silanol hydroxyl group and a compound having a silanol group are subjected to dehydrative condensation in the presence of a compound of formula (1), (2) or (3):
MX
n
(1)
Z
a
SiR
1
b
R
2
c
R
3
d
(2)
C
m
F
2m+1
SO
3
Y (3)
wherein M is a metal, n is the valence of metal M, and X is halogen or C
m
F
2m+1
SO
3
; a=1 to 4, b, c and d=0 to 3, a+b+c+d=4, R
1
, R
2
and R
3
are monovalent hydrocarbon groups, Z is halogen or C
m
F
2m+1
SO
3
; Y is H or HW, W is an amine NR
4
R
5
R
6
or a nitrogen-containing heterocyclic compound, R
4
, R
5
and R
6
are H or monovalent hydrocarbyl groups, and m=0 to 10. The method is effective in silylating the hydroxyl group without generating a substantial amount of harmful by-products such as hydrogen chloride or triethylamine hydrochloride.
METHOD FOR SYNTHESIS OF HALOPYRIDYL-ACYCLOPENTANE DERIVATIVE AND INTERMEDIATE THEREOF
申请人:——
公开号:US20020010339A1
公开(公告)日:2002-01-24
The present invention relates to a method for synthesis of an optically active halopyridyl-azacyclo-pentane derivative and the intermediate thereof which comprises preparing an optically active allene-1,3-dicarboxylic acid ester derivative from an optically active acetonedicarboxylic acid ester derivative and then proceeding through a 7-azabicyclo[2.2.1]heptane derivative to obtain the objective product.
NOVEL COMPOUNDS AND METHODS FOR SYNTHESIS AND THERAPY
申请人:BISCHOFBERGER NORBERT W.
公开号:US20050176758A1
公开(公告)日:2005-08-11
Novel compounds are described. The compounds generally comprise an acidic group, a basic group, a substituted amino or N-acyl and a group having an optionally hydroxylated alkane moiety. Pharmaceutical compositions comprising the inhibitors of the invention are also described. Methods of inhibiting neuraminidase in samples suspected of containing neuraminidase are also described. Antigenic materials, polymers, antibodies, conjugates of the compounds of the invention with labels, and assay methods for detecting neuraminidase activity are also described.