Donor–Acceptor Binary Photocatalysis System Illustrated by the Intramolecular Cyclization of a Cyclopropanone Acetal Tethered to Cyclohexen-2-one
作者:Akira Oku、Toshiyuki Miki、Manabu Abe、Masatoshi Ohira、Tohru Kamada
DOI:10.1246/bcsj.72.511
日期:1999.3
Irradiation of 2-[3-(2-methoxy-1-phenyl-2-TBDMSO-cyclopropyl)-propyl]-2-cyclohexen-1-one (5) in the presence of Mg(ClO4)2 (1 mol equiv) and 9,10-dicyanoanthracene (DCA, 0.5 mol equiv) in acetonitrile formed methyl 5-oxo-1-phenyldecahydro-1-naphthaleneacetate (6) in 63% yield. When pyrene was adopted in place of DCA, the yield of 6 was 38%. The results indicate that the photocyclization of 5 induced by the SET can be catalyzed by both donor- and acceptor-type photocatalysts. Irradiation of a similar substrate, 4-(2-methoxy-1-phenyl-2-TBDMSO-cyclopropyl)butyl 2-naphthyl ketone (21), produced methyl 2-hydroxy-2-(2-naphthyl)-1-phenylcyclohexaneacetate (27) in 13% in the presense of p-dicyanobenzene (0.1 mol equiv) and 8% in its absence.
对2-[3-(2-甲氧基-1-苯基-2-TBDMSO-环丙基)-丙基]-2-环己烯-1-酮(5)进行照射,在Mg(ClO4)2(1摩尔当量)和9,10-二氰基蒽(DCA,0.5摩尔当量)存在下,于乙腈中生成甲基5-氧代-1-苯基十氢-1-萘酸酯(6),产率为63%。当用芘替代DCA时,6的产率为38%。结果表明,5的光循环化反应通过单电子转移(SET)可被供体和受体类型的光催化剂催化。类似底物4-(2-甲氧基-1-苯基-2-TBDMSO-环丙基)丁基-2-萘酮(21)的照射,在存在对-二氰基苯(0.1摩尔当量)时产生甲基2-羟基-2-(2-萘基)-1-苯基环己烷酸酯(27),产率为13%,而在其缺失时产率为8%。