Direct β-C(sp<sup>3</sup>)–H Functionalization of Aliphatic Amines to α,β-Unsaturated Imines, Aldehydes, and Chromenes
作者:Sumana Mandal、Sujit Mahato、Chandan K. Jana
DOI:10.1021/acs.orglett.5b01744
日期:2015.8.7
functionalization of aliphatic amine was developed. The method is based on a reaction that yields enamine directly from the corresponding aliphatic amine, which otherwise requires the aid of metallic reagent and/or external oxidant. The reaction is operationally simple, general, and highly efficient in functionalizing both cyclic and acyclic amines. Structurally diverse unsaturated imines were obtained from N-heterocycles
β-Trimethylsilyl enol ethers 1 (Z) obtained from β-bromoenolethers 2 were condensed with aliphatic and aromatic aldehydes in the presence of a catalytic quantity of trimethylsilyl triflate leading to ethylenic aldehydes 3 (E) with good yields (79–90%).
Synthesis of substituted hexa-3,5-dienoic acid methyl esters from conjugated dienones
作者:Rishan Lang Nongkhlaw、Ridaphun Nongrum、Bekington Myrboh
DOI:10.1039/b101242h
日期:——
Substituted hexa-3,5-dienoic acid methyl esters (2) were conveniently prepared in one step by 1,2-carbonyl transposition of the corresponding dienones (1) using lead(IV) acetate and boron trifluoride–diethyl ether in benzene at room temperature.
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
The present invention concerns the use as perfuming ingredients of para-substituted derivatives of α-methyl cinnamic alcohol of formula (I) in the form of any one of its stereoisomers or a mixture thereof, and wherein R represents a hydrogen atom, a C1-4 alkyl or alkenyl group or a formyl or acetyl group; R1 represents a hydrogen atom or a methyl group; R2 represents a methyl, ethyl or methoxy group; and R3 represents a CH2 group or a carbon-carbon double bond. The present invention concerns the use of said compound in the perfumery industry as well as the compositions or articles containing said compound.