Synthesis of Axially Chiral Olefin-Oxazoline Ligands via Pd-Catalyzed Multiple C-H Functionalization.

We report herein the Pd-catalyzed oxazoline-directed C-H olefination of the -arylindole skeleton, affording two diastereomers of axially chiral olefin-oxazoline ligands in a one-step procedure. Modifications at the 3- and 3'-positions were facilely achieved via electrophilic substitution of the indole fragment and subsequent oxazoline-directed C-H amidation or olefination of the arene fragment.