NHC-Catalyzed Enantioselective [3 + 3] Annulation to Construct 5,6-Dihydropyrimidin-4-ones
摘要:
The unprecedented enantioselective NHC-catalyzed [3 + 3] annulation of alpha-bromoenals with amidines via a dual C-N bond formation is described. The protocol allows a rapid preparation of 5,6-dihydropyrimidinones in acceptable yields with good enantioselectivities.
A rhodium-catalyzedC-Hactivation/annulation of amidines with 4-diazoisochroman-3-imines has been established to afford a series of 8-amino-5H-isochromeno[3,4-c]isoquinolines in moderate to good yields with good functional group tolerance. This reaction proceeded in a sequential C-Hactivation/carbene migration insertion/intramolecularannulation procedure and featured the construction of a C-C and