Catalytic atroposelective synthesis of indolyl quinazolinones bearing N–N/C–C diaxes
摘要
The first catalytic atroposelective synthesis of indole derivatives bearing N–N/C–C diaxes has been established by the strategy of de novo ring formation. By this strategy, various indolyl quinazolinones bearing vicinal N–N/C–C diaxes were synthesized in high yields with overall good diastereoselectivities and excellent enantioselectivities via chiral phosphoric acid-catalyzed one-pot asymmetric formal (5 + 1) cycloaddition/oxidation reaction. Moreover, such indolyl quinazolinones bearing vicinal N–N/C–C diaxes have good configurational stability and could be converted into new chiral ligands with applications in asymmetric catalysis. Therefore, this work not only offered a new member for the family of diaxial atropisomers, but also provided a powerful strategy for catalytic asymmetric synthesis of atropisomers bearing N–N/C–C diaxes.