Optically active compound and process for producing the same
申请人:Takasago International Corporation
公开号:US05998668A1
公开(公告)日:1999-12-07
An optically active (2S,3R)-2-(3'-hydroxyacyl)aminoalkane-1,3-diol and a process for producing the same are disclosed. The compound is represented by the following general formula (1): ##STR1## wherein R.sup.1 represents a linear or branched, saturated aliphatic hydrocarbon group having 9 to 19 carbon atoms; R.sup.2 represents a linear or branched, saturated aliphatic hydrocarbon group having 1 to 19 carbon atoms; and symbol * means that the carbon atom is an asymmetric carbon atom of the S or R configuration. The optically active compound is a ceramide in which the fatty acid moiety has an optically active hydroxyl group in the 3-position.
Structural and synthetic studies of the spore germination autoinhibitor, gloeosporone
作者:Stuart L. Schreiber、Sarah E. Kelly、John A. Porco、Tarek. Sammakia、Edward M. Suh
DOI:10.1021/ja00226a041
日期:1988.8
conidia of Colletotrichum gloeosporioides. The structure initially proposed by Meyer et al. contained an unusual oxOcane ring system (la). A stereoselectivesynthesis of one of the two possible stereoisomeric forms of the oxocane structure that cast doubt on the structural proposal is described. Reinvestigation of the natural product resulted in the formulation of a structure that contains a 14-membered macrolide
The Preparation of Optically Pure 3-Hydeoxybutanoic Acid and Its Homologues as the Dibenzylammonium Salt
作者:Tadashi Kikukawa、Yoshitomi Iizuka、Takashi Sugimura、Tadao Harada、Akira Tai
DOI:10.1246/cl.1987.1267
日期:1987.7.5
Optically pure (R)- and (S)-3-hydroxybutanoic acid and itshomologues are prepared by the method consisting of the enantioface differentiating hydrogenation of methyl 3-oxoalkanoate to methyl 3-hydroxyalkanoate(80–90% e.e.) over asymmetrically modified nickel catalyst and the preferential crystallization of optically pure 3-hydroxyalkanoic acids from the hydrogenation products as the dibenzylammonium
An Improved Asymmetric Reformatsky Reaction Mediated by (−)-<i>N</i>,<i>N</i>-Dimethylaminoisoborneol
作者:Ralf J. Kloetzing、Tobias Thaler、Paul Knochel
DOI:10.1021/ol0531381
日期:2006.3.1
(-)-N,N-Dimethylaminoisoborneol ((-)-DAIB) was found to be an excellent ligand for the enantioselective addition of Reformatsky reagents to aromatic and aliphatic aldehydes. Enantioselectivities up to 93% ee were obtained with sulfur-containing aldehydes.
An examination of the extent of diasterofacial selection in the reactions of a chiral nitrile oxide with achiral alkenes: a route to β-hydroxy carboxylic acids
作者:Alan P. Kozikowski、Yoshinori Kitagawa、James P. Springer
DOI:10.1039/c39830001460
日期:——
A new synthesis of optically active β-hydroxycarboxylicacids has been developed which is based on the (modest) diastereoselective addition of the chiralnitrileoxide (4) to 1,2-disubstituted alkenes.