Photoinduced Atom-Transfer Cyclization of α-Iodocycloalkanones Bearing an Allenyl Side Chain
摘要:
Irradiation of alpha-iodocycloalkanones bearing an allenyl side chain with a sunlamp effected atom-transfer cyclization to give cyclized products in good yield. A mechanism, involving radical atom-transfer cyclization accompanied by 1,5- and 1,4-hydrogen transfers, is proposed.
Photoinduced Atom-Transfer Cyclization of α-Iodocycloalkanones Bearing an Allenyl Side Chain
摘要:
Irradiation of alpha-iodocycloalkanones bearing an allenyl side chain with a sunlamp effected atom-transfer cyclization to give cyclized products in good yield. A mechanism, involving radical atom-transfer cyclization accompanied by 1,5- and 1,4-hydrogen transfers, is proposed.
AlCl3/ICl-mediated iodocarbocyclizations of alpha-iodocycloalkanones bearing an allenyl side chain are described. Treatment of iodocycloalkanones 4a-i with AlCl3/ICl gave spirocyclic cycloalkanones 5a-i and 6a-i as a mixture of products. (c) 2005 Elsevier Ltd. All rights reserved.