A new photochemical synthesis of benzoxazolo[3,2-b]isoquinolin-11-one and isoquinolino[3,2-b][1,3]benzoxazin-11-one
摘要:
Photocyclization of substituted tetrahydroisoquinoline-1,3-diones, under base-mediated conditions, afforded benzoxazolo[3,2-b]isoquinotin-11-ones and an isoquinolino[3,2-b]benzoxazin-11-one. (C) 2002 Elsevier Science Ltd. All rights reserved.
Irradiation of N-phenyl substituted isoquinolines in acetonitrile containing 1 M NaOH in a multilamp reactor (MLR) furnished benzoxazolo[3,2-b]isoquinolin-11-ones. In contrast, irradiation of the N-benzyl substituted isoquinoline derivative under the same conditions afforded the hydrolysed N-benzylbenzamide derivative. The isoquinolinobenzoxazine was obtained by irradiating the N-benzyl substituted isoquinoline derivative at higher basic conditions. The required isoquinolines were synthesized under solvent-free, solid supported microwave conditions. (c) 2005 Elsevier Ltd. All rights reserved.