Abstract
| - Condensations of chiral diamines 11a−c with benzotriazole and formaldehyde gave benzotriazolylintermediates 12a−c; similar condensations of α-amino-amides 10a−c with benzotriazole andparaformaldehyde gave 14a−c. Subsequent treatment of 12a−c and 14a−c with AlCl3 led toenantiopure tricyclic 1,2,3,5,10,10a-hexahydroimidazo[1,5-b]isoquinolines 1a−c and 2,3,10,10a-tetrahydroimidazo[1,5-b]isoquinolin-1(5H)-ones 15a−c, respectively, via Lewis acid promotediminium cation cyclizations.
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