Cationic 2-Azabutadienes from α-Arylaminosulfones and α-Arylaminonitriles: Intermolecular Polar [4π++2π]-Cycloadditions for the Regio- and Diastereoselective Synthesis of 1,2,3,4-Tetrahydroquinolines

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Abstract
The intermolecular polar [4π+ + 2π]-cycloaddition of cationic 2-azabutadienes, which are generated in situ from α-arylaminosulfones and α-arylaminonitriles, respectively, with different dienophiles regio- and diastereoselectively yield 1,2,3,4-tetrahydroquinolines with yields from 66 to 92%.