Regio- and Stereoselective Ring-Opening Reactions of Epoxides with Indoles and Pyrroles in 2,2,2-Trifluoroethanol
作者:Martin Westermaier、Herbert Mayr
DOI:10.1002/chem.200701366
日期:2008.2.8
Aliphatic and aromatic epoxides react regio- and stereoselectively with indoles and pyrroles in 2,2,2-trifluoroethanol without the use of a catalyst or any other additive. While aromatic epoxides are selectively attacked at the benzylic position, aliphatic epoxides react at the less-substituted position. Chiral epoxides react with >99 % ee (ee=enantiomeric excess).
Friedel–Crafts alkylation with α-bromoarylacetates for the preparation of enantioenriched 2,2-diarylethanols
作者:Yongtae Kim、Yun Soo Choi、Su Kyung Hong、Yong Sun Park
DOI:10.1039/c9ob00706g
日期:——
through the Friedel–Crafts alkylation of (hetero)arenes with configurationally labile α-bromoarylacetates. The substitution of highly diastereoenriched α-bromoarylacetates occurs in the presence of AgOTf, and the subsequent reduction affords diverse 2,2-diarylethanols with high yields and enantioselectivities up to 99 : 1 er. In addition, the application of this asymmetric synthetic methodology to the