Symmetric esters by Tischtschenko reaction of aldehydes catalyzed by bi- and tridentate catalysts derived from catechol or gallol, trimethylaluminum and isopropanol
作者:Ilkka Simpura、Vesa Nevalainen
DOI:10.1016/s0040-4020(01)01004-3
日期:2001.12
New inexpensive aluminum-based bidentate and tridentate chelates were found to be efficient catalysts for the Tischtschenkoreaction of aldehydes. The conversion of n-butanal to n-butyl n-butyrate using catechol-derived catalysts at room temperature was complete (the yield of the butyrate was 99%) in two hours. High yields of symmetric esters were obtained in the case of n-alkyl and α-branched aliphatic
Isopropoxyaluminum 1,1′-biphenyl-2-oxy-2′-perfluorooctanesulfonamide (3) has been evaluated as an aluminum-based catalyst for the Tishchenkoreaction. Compound 3 was found to exert high catalytic activity in the reaction with aliphatic aldehydes and also enabled smooth dimerization of enolizable aldehydes. This advantage was highlighted by the quantitative formation of ethyl acetate from acetaldehyde
Diaminocyclopentadienone Ruthenium Complex Catalyzed Alkylation of Indoles and Ketones with Primary Alcohols
作者:Steffen Skowaisa、Edgar Haak
DOI:10.1002/ejoc.202300707
日期:——
The borrowing hydrogen approach allows the direct utilization of non-activated alcohols as alkylating agents. A readily available, air and moisture stable ruthenium complex proves to be a particularly effective hydrogen autotransfer catalyst for the alkylation of various indoles or ketones with poorly reactive alcohols.