Four-Component Synthesis of Star-Shaped 2-(Indol-3-yl)pyridine Derivatives in One Pot
摘要:
A protocol for the synthesis of star-shaped 2-(indol-3-yl)pyridine derivatives 4, neat, in the presence of iodine as a catalyst was developed (method A). Based on this strategy, compounds 4-aryl-2-(1H-indol-3-yl)-6-arylnicotinonitriles 6 were synthesized from 3-(cynonoacetyl)indole 1, aromatic aldehyde 2, aromatic ketone 5, and AcONH4 under the conditions of both methods A (solvent free) and B (using AcOH as solvent). The compounds 4-aryl-2-(1H-indol-3-yl)-6-(thiophen-2-yl)nicotinonitriles 8 were also prepared under the conditions of method B.