The α-alkylation of ketones using an earth-abundant and nonprecious NiBr2/L1 system is reported. This nickel-catalyzed reaction could be performed in gram scale and successfully applied in the synthesis of donepezil (Alzheimer’s drug) and functionalization of steroid hormones and fatty acid derivatives. Synthesis of N-heterocycles, methylation of ketones, and one-pot double alkylation to bis-hetero
Herein an operationally simple alkylation of methylene ketones with primary alcohols is reported. Use of an inexpensive and earth abundant Mn/1,10-phenanthroline system enables direct access to a series of functionalised branchedketones including one-pot sequential double alkylation and Alzheimer's drug donepezil. Preliminary mechanistic investigation, determination of the rate and order of reactions
Iridium-catalyzed selective α-methylation of ketones with methanol
作者:Shinji Ogawa、Yasushi Obora
DOI:10.1039/c3cc49626k
日期:——
Iridium-catalyzed selective α-dimethylation and α-methylation of ketones or phenylacetonitriles, using methanol as the methylating agent, were achieved.
铱催化的选择性α-二甲基化和α-甲基化反应成功地在酮或苯乙腈中进行,甲醇作为甲基化试剂。
A New Synthesis of Tri- and Tetrasubstituted Olefins Based on Thio- and Selenophosphates
Stereoselective synthesis of tri- and tetrasubstituted functionalized olefins and newphosphates bearing functionalized cyclic substituent has been developed using thiophosphates and selenophosphates as key intermediates.
Method for producing an aromatic compound having an alkyl group with at least three carbon atoms
申请人:TORAY INDUSTRIES, INC.
公开号:EP0985649A2
公开(公告)日:2000-03-15
Aromatic compounds having an alkyl group with at least 3 carbon atoms are produced in a process comprising at least one of the following steps:
(1) a step of contacting a starting material that contains an aromatic compound having a branched alkyl group with at least 3 carbon atoms, with a zeolite-containing catalyst in a liquid phase in the presence of hydrogen therein, thereby changing the position of the carbon atoms of the alkyl group bonding to the aromatic ring of the compound;
(2) a step of contacting a starting material that contains an aromatic compound having a branched alkyl group with at least 3 carbon atoms, with a catalyst containing zeolite and containing rhenium and/or silver, in a liquid phase, thereby changing the position of the carbon atoms of the alkyl group bonding to the aromatic ring of the compound;
(3) a step of contacting a halogenated aromatic compound having an alkyl group with at least 3 carbon atoms, with an acid-type catalyst, thereby isomerizing the compound; and
(4) a step of treating a mixture of isomers of an aromatic compound having an alkyl group with at least 3 carbon atoms, with a zeolite adsorbent that contains at least one exchangable cation selected from alkali metals, alkaline earth metals, lead, thallium and silver, thereby separating a specific isomer from the isomer mixture through adsorption.