Ruthenium-Catalyzed Selective C−C Coupling of Allylic Alcohols with Free Indoles: Influence of the Metal Catalyst
作者:Ying-Qi Xia、Chao Li、Man Liu、Lin Dong
DOI:10.1002/chem.201706080
日期:2018.4.11
Versatile reactive activities of allyl alcohols with free indoles in C-H functionalization reactions were investigated. Direct alkylation or cascade cyclization reactions could be selectively controlled based on the catalyst system: Ru(PPh3 )3 Cl2 provided C3-substituted β-ketone indoles whereas [Ru(p-cymene)Cl2 ]2 yielded cyclized indoles.
Palladium-Catalyzed Enantioselective C-3 Allylation of 3-Substituted-1<i>H</i>-Indoles Using Trialkylboranes
作者:Barry M. Trost、Jean Quancard
DOI:10.1021/ja0608139
日期:2006.5.1
We have developed a new enantioselective C-3 allylation of 3-substituted indoles using allyl alcohol and trialkylboranes. Asymmetric syntheses of 3,3-disubstituted indolines and indolenines in enantiomeric excesses up to 90% have been achieved using the bulky borane 9-BBN-C6H13 as the promoter of the reaction. The dependence of the selectivity on the nature of the borane suggests that the boron reagent has a role beyond promoting ionization of the allyl alcohol. A protocol for oxidation of indolenines to oxindoles has also been developed and led to a formal synthesis of (-)-phenserine.