synthesis of biologically important indenes bearing three substituent groups at the 1-, 2-, and 3-positions from available o-ethynylbenzaldehyde derivatives and organoboron reagents under palladium(0) catalysis is described. A two-component coupling reaction in methanol provides 1H-indenols, whereas a three-component reaction involving secondary aliphatic amines as the third component in DMF affords 1H-indenamines
Chiral counteranion-directed silver-catalyzed asymmetric synthesis of 1,2-dihydroisoquinolines by Friedel–Crafts alkylation reactions
作者:Jun-Wei Zhang、Zhe Xu、Qing Gu、Xiao-Xin Shi、Xue-Bing Leng、Shu-Li You
DOI:10.1016/j.tet.2012.02.058
日期:2012.7
The reaction of ortho-alkynylaryl aldimines and indoles catalyzed by a silver binol-derived phosphate was realized to afford a series of enantioenriched 1,2-dihydroisoquinolines in moderate to good yields and ee. An interesting phenomenon that highly enantioenriched products could be obtained from their lower ee form by silica gel column chromatography was observed, providing an easy access to the