One‐Pot Three‐Component Syntheses of Indoloquinolizidine Derivatives Using an Organocatalytic Michael Addition and Subsequent Pictet–Spengler Cyclization
one‐pot three‐component cascade sequence towards highly substituted indoloquinolizidines in moderate to good yields with excellent enantioselectivities was developed (see scheme). The absolute stereochemistry at C2 and C12 b was created by the organocatalyzed conjugateaddition of in situ formed indole‐tethered β‐enaminoesters to α,β‐unsaturatedaldehydes, and a subsequent acid‐promoted intramolecular