Synthesis of tricyclic-2-aminoindoles by intramolecular 1,3-dipolar cycloaddition of 1-ω-azidoalkylindoles
摘要:
Thermolysis of the 1-omega -azidoalkylindoles 4, bearing an electron attracting substituent at C-3 (CHO, COMe, COOMe, CN) provides imidazo[1,2-a]indoles (5, n = 1), pyrimidino[1,2-a]indoles (5, n = 2), and 1,3-diazepino[1,2-a]indoles (5, n = 3). (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthesis of tricyclic-2-aminoindoles by intramolecular 1,3-dipolar cycloaddition of 1-ω-azidoalkylindoles
摘要:
Thermolysis of the 1-omega -azidoalkylindoles 4, bearing an electron attracting substituent at C-3 (CHO, COMe, COOMe, CN) provides imidazo[1,2-a]indoles (5, n = 1), pyrimidino[1,2-a]indoles (5, n = 2), and 1,3-diazepino[1,2-a]indoles (5, n = 3). (C) 2001 Elsevier Science Ltd. All rights reserved.
tandem [4+2] cyclization between N‐(2‐iodoethyl)indoles and a variety of alkenes leads to tri‐ and tetracyclic benzindolizidines with high diastereoselectivity and yield. The intermolecular annulation reaction is performed under visible‐light irradiation and employs [Ir(ppy)3] or [Ir(dtbbpy)(ppy)2] PF6 as photocatalysts, in combination with tertiary amines as electron and hydrogenatom donors.