Dehydrogenative β-Arylation of Saturated Aldehydes Using Transient Directing Groups
摘要:
An unprecedented cross-dehydrogenative-coupling (CDC) reaction of saturated aldehyde beta-C-H with arenes to form cinnamaldehydes via the cleavages of four C-H bonds has been developed. The reaction possesses complete E-stereoselectivity for the C = C double bond. The protocol is featured by atom and step economy, mild reaction conditions, and convenient operation.
CATALYST FOR ASYMMETRIC HYDROGENATION AND METHOD FOR MANUFACTURING OPTICALLY ACTIVE CARBONYL COMPOUND USING THE SAME
申请人:YAMADA Shinya
公开号:US20120136176A1
公开(公告)日:2012-05-31
The present invention provides a catalyst used for manufacturing an optically active carbonyl compound by selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which is insoluble in a reaction mixture, and a method for manufacturing the corresponding optically active carbonyl compound. Particularly, the invention provides a catalyst for obtaining an optically active citronellal useful as a flavor or fragrance, by selective asymmetric hydrogenation of citral, geranial or neral. The invention relates to a catalyst for asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which comprises: a powder of at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table, or a metal-supported substance in which the at least one metal is supported on a support; an optically active peptide compound; and an acid, and also relates to a method for manufacturing an optically active carbonyl compound using the same.
This invention aims at providing a catalyst for producing an optically active aldehyde or an optically active ketone, which is an optically active carbonyl compound, by carrying out selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, particularly a catalyst which is insoluble in a reaction mixture for obtaining optically active citronellal which is useful as a flavor or fragrance, by carrying out selective asymmetric hydrogenation of citral, geranial or neral; and a method for producing a corresponding optically active carbonyl compound. The invention relates to a catalyst for asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which comprises a powder of at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table, or a metal-supported substance in which at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table is supported on a support, an optically active cyclic nitrogen-containing compound and an acid.
Conversion of 2-Alkylcinnamaldehydes to 2-Alkylindanones via a Catalytic Intramolecular Friedel−Crafts Reaction
作者:Gary B. Womack、John G. Angeles、Vincent E. Fanelli、Christie A. Heyer
DOI:10.1021/jo070952o
日期:2007.8.31
3-arylpropanoic acids or halides requires the use of noncatalytic acid promoters. In the presence of 5−10 mol % FeCl3, in situ generated dimethyl acetals of (E)-2-alkylcinnamaldehydes cyclize to 1-methoxy-2-alkyl-1H-indenes in good-to-high yields. The 1-methoxyindenes were converted in high yield into 2-alkylindanones by treatment with triethylamine, to effect isomerization to the isomeric enol ethers
PROCESS FOR PRODUCING ALPHA, BETA-UNSATURATED ALDEHYDE COMPOUNDS
申请人:Ishida Kosaku
公开号:US20090171124A1
公开(公告)日:2009-07-02
The present invention relates to processes for producing α,β-unsaturated aldehyde compounds and unsaturated alcohols with a good yield. There is provided a process for producing and α,β-unsaturated aldehyde compound including the step of subjecting a raw aldehyde compound to an intermolecular condensation reaction in the presence of an amine and a protonic acid having 4 to 20 carbon atoms or a salt thereof; and a process for producing an unsaturated alcohol including the step of subjecting the α,β-unsaturated aldehyde compound to a reduction reaction.
Verfahren zur Herstellung von heterocyclischen tertiären Aralkylaminen
申请人:BASF Aktiengesellschaft
公开号:EP0017893A1
公开(公告)日:1980-10-29
Verfahren zur Herstellung von Aralkylaminen der Formel
in der R1 ein Wasserstoffatom, einen aliphatischen Rest, einen cycloaliphatischen Rest oder eine Alkoxygruppe, R2, R3 und R4 ein Wasserstoffatom oder einen Alkylrest, X1, X2, X3 und X4 ein Wasserstoffatom oder einen Alkylrest, A den Rest
X10 ein Wasserstoffatom oder einen Alkylrest und n die Zahlen 2, 3 oder 4 bedeutet, durch Umsetzung von sekundären Aminen mit Carbonylverbindungen in Gegenwart von Wasserstoff und einem Hydrierkatalysator, der Palladium im Gemisch mit Zink, Cadmium, Mangan und/oder einem Oxid der Seltenen Erdmetalle auf einem inerten Träger enthält.