- Functionalization of benzylic C(sp(3))-H bonds of heteroaryl aldehydes through N-heterocyclic carbene organocatalysis.
Functionalization of benzylic C(sp(3))-H bonds of heteroaryl aldehydes through N-heterocyclic carbene organocatalysis.
Angewandte Chemie (International ed. in English) (2013-09-17)
Xingkuan Chen, Song Yang, Bao-An Song, Yonggui Robin Chi
PMID24038663
ABSTRACT
Aryl aldehyde activation: Oxidative activation of 2-methylindole-3-carboxaldehyde (I) through N-heterocyclic carbene (NHC) organocatalysis generates heterocyclic ortho-quinodimethane (II) as a key intermediate. This intermediate then undergoes formal [4+2] cycloaddition with trifluoromethyl ketones or isatins to form polycyclic lactones containing a quaternary carbon center.
MATERIALS