[(NHC)Au<sup>I</sup>]-Catalyzed Rearrangement of Allylic Acetates
作者:Nicolas Marion、Ronan Gealageas、Steven P. Nolan
DOI:10.1021/ol070843w
日期:2007.7.1
[(NHC)AuCl] complexes (NHC = N-heterocycliccarbene), in conjunction with a silver salt, were found to efficiently catalyze the rearrangement of allylic acetates under both conventional and microwave-assisted heating. The optimization of several reaction parameters (solvent, silver salt, and ligand) as well as a study of the reaction scope are reported. The steric hindrance of the ligand bound to gold was
indoles and allyl acetates/alcohols. The reaction tolerates many functional groups and selectively affords the branched C3-allylated products from both α- and γ-substituted allyl substrates. It takes the advantage of the hemilabile character of the P∧N ligand. The C(sp2)–C(sp3) coupling operates via a Au(I)/Au(III) redox cycle and involves a dicationic π-allyl Au(III) complex as a key intermediate. In this
Structure−Activity Relationships of (1‘<i>S</i>)-1‘-Acetoxychavicol Acetate, a Major Constituent of a Southeast Asian Condiment Plant <i>Languas</i> <i>galanga</i>, on the Inhibition of Tumor-Promoter-Induced Epstein−Barr Virus Activation
the terminal methylenegroup abolishes activity; (3) both the phenolic and alcoholic hydroxyl groups are compulsorily acetylated, and it is necessary that the former is oriented only at the position para to the side chain; (4) an additional acetoxyl group is allowed to locate at the ortho or meta position; and (5) substitution of the hydrogen atom at the 1'-position by a methyl group reduces activity
Kinetic resolution of allylic alcohols via stereoselective acylation catalyzed by lipase PS-30
作者:Peiran Chen、Peng Xiang
DOI:10.1016/j.tetlet.2011.08.093
日期:2011.11
By using lipase PS-30 as catalyst, the kineticresolution of a series of racemic allylic alcohols has been achieved via stereoselective acylation. The value of kinetic enantiomeric ratio (E) reached up to 968. Substituent effect is briefly discussed.
Synthesis and C2-functionalization of indoles with allylic acetates under rhodium catalysis
作者:Mirim Kim、Jihye Park、Satyasheel Sharma、Sangil Han、Sang Hoon Han、Jong Hwan Kwak、Young Hoon Jung、In Su Kim
DOI:10.1039/c3ob41828f
日期:——
Tandem rhodium-catalyzed oxidative allylation and annulation of acetanilides with allyl acetate to afford the corresponding indoles are described. In addition, the site-selective C2 allylation, crotylation and prenylation of indoles using allylic acetates under rhodium catalysis are reported.