Enantioselective Intramolecular C−H Insertion of Donor and Donor/Donor Carbenes by a Nondiazo Approach

The first enantioselective intramolecular C−H insertion and cyclopropanation reactions of donor- and donor/donor-carbenes by a nondiazo approach are reported. The reactions were conducted in a one-pot manner without slow addition and provided the desired dihydroindole, dihydrobenzofuran, tetrahydrofuran, and tetrahydropyrrole derivatives with up to 99 % ee and 100 % atom efficiency.