The asymmetric synthesis of highly functionalized pyrrolidine derivatives with three contigious stereogenic centers and bearing a trifluoromethyl group has been developed through an organocatalytic domino Michael/Mannich [3+2] cycloaddition sequence. Employing...
The concise totalsynthesis of an unusual alkaloid, aplaminal, has been accomplished. The synthetic feature is the Buchwald–Hartwig cross-coupling between a novel triazabicyclo[3.2.1]octane core and an aromatic bromide. The practicality of our approach provides aplaminal analogs and preliminary structure–cytotoxicity relationships of an aromatic moiety were achieved.
High-pressurereaction of 2,5-dimethylfuran with various carbonylcompounds: butyl glyoxylate, chloral, methyl mesoxalate, methyl pyruvate, and 2,3-O-isopropylidene-D-glyceraldehyde, gives the adducts (4), probably the products of an enereaction.
Displacement of Dinitrogen by Oxygen: A Methodology for the Catalytic Conversion of Diazocarbonyl Compounds to Ketocarbonyl Compounds by 2,6-Dichloropyridine-<i>N</i>-oxide
作者:Yang Yu、Qiang Sha、Hui Cui、Kory S. Chandler、Michael P. Doyle
DOI:10.1021/acs.orglett.7b03912
日期:2018.2.2
Dirhodium(II) catalyzed dinitrogen extrusion from diazocarbonyl compounds by 2,6-dichloropyridine-N-oxide forms ketocarbonyl compounds in near-quantitative yields. Reactions occur at room temperature, and the pyridine product does not coordinate with dirhodium(II) to inhibit catalysis. Anhydrous tricarbonyl compounds, as well as dicarbonyl compounds, are conveniently prepared by this methodology, and
Organic compounds and their use as pharmaceuticals
申请人:Lilly S.A.
公开号:US05021449A1
公开(公告)日:1991-06-04
A pharmaceutical compound of the formula ##STR1## in which R.sup.1 is --CHO, CH.sub.2 OH, --CH.sub.2 OC.sub.1-4 alkyl, --COC.sub.1-3 alkyl, --CH(OH)C.sub.1-3 alkyl or --COOH, R.sup.2 is C.sub.1-4 alkyl, --CHO, --CH.sub.2 OH, --CH.sub.2 OC.sub.1-4 alkyl, --COC.sub.1-3 alkyl, --CH(OH)C.sub.1-3 alkyl or --COOH, R.sup.3 is C.sub.1-4 alkyl and X is pyrrolidinyl or pyrrolidinylmethyl; and salts and esters thereof.