Sc(OTf)3-Catalyzed Indolylation of 1,2-Allenic Ketones: Controlled Highly Selective Synthesis of β-Indolyl-α,β-unsaturetated (E)-Enones and β,β-Bisindolyl Ketones
摘要:
A novel highly stereoselctive synthesis of beta-indolyl-alpha,beta-unsaturated (E)-enones by the hydroindolylation of the beta,gamma-C=C bond of 1,2-allenic ketones in the presence of 5 mol % Sc(OTf)(3) was developed. beta,beta-Bisindolyl ketones were prepared by using 2.5 equiv of indoles. A stepwise protocol for introducing different indoles was also established.
Sc(OTf)3-Catalyzed Indolylation of 1,2-Allenic Ketones: Controlled Highly Selective Synthesis of β-Indolyl-α,β-unsaturetated (E)-Enones and β,β-Bisindolyl Ketones
摘要:
A novel highly stereoselctive synthesis of beta-indolyl-alpha,beta-unsaturated (E)-enones by the hydroindolylation of the beta,gamma-C=C bond of 1,2-allenic ketones in the presence of 5 mol % Sc(OTf)(3) was developed. beta,beta-Bisindolyl ketones were prepared by using 2.5 equiv of indoles. A stepwise protocol for introducing different indoles was also established.