Alpha-hydroxy-beta-azido tetrazole compounds of formula (I):
a process for manufacturing alpha-hydroxy-beta-azido tetrazoles of formula (I), and their use for synthesizing new compounds, e.g. in “click” chemistry.
The octopus compound, readily derived from hexakis(mercaptomethyl)benzene and 1-chloro-3,6,9-trioxadecane, was effectively employed as a catalyst in the two-phase Darzenscondensation of carbonyl compounds with chloroacetonitrile to afford the corresponding oxiranes in good yields.
Isomerization of glycidic esters and nitriles to the corresponding 2-hydroxy-3-alkenoates and their nitrile derivatives occurred on treatment with triphenylsilyl perchlorate or electrogenerated acid (EG acid). The cyanohydrin moiety of the nitriles 4 was transformed to a formyl group, giving the corresponding enals on treatment with weak base.
Quaternary ammonium salts used as phase transfer catalyst
申请人:Alter, S.A.
公开号:US04880894A1
公开(公告)日:1989-11-14
Novel quaternary ammonium salts of general formula (I) ##STR1## wherein: R is a saturated or unsaturated, linear or branched alkyl radical of C.sub.1 to C.sub.8. R' is a saturated or unsaturated, linear or branched alkyl radical of C.sub.1 to C.sub.12, or a benzyl radical. n is a number equal to 2 or 3. X.sup..theta. is a halogenide anion, such as Cl.sup..theta., Br.sup..theta., I.sup..theta., are used as phase transfer catalysts, in heterogeneous ionic reactions wherein the reagents are in different phase and have different polarity.
Process for the stereoselective preparation of functionalized vicinal diols
申请人:BAYER AG
公开号:EP1291436A1
公开(公告)日:2003-03-12
The present invention relates to a process for the kinetic resolution of racemic functionalized epoxides in the presence of microorganisms, crude or pure preparations thereof comprising a polypeptide having epoxide hydrolase activity. Preferred microorganisms are yeasts and bacteria which may also be recombinant.