Gold-catalyzed consecutive [1,2] alkyl migration-oxygen transfer reaction of 2-alkynyl-1-tetralones
作者:Ching Siew Chan、Toshiharu Araki、Itaru Nakamura、Masahiro Terada
DOI:10.1016/j.tetlet.2008.10.129
日期:2009.1
ketones in good to high yields. For example, the reaction of 2-4-(methoxyphenyl)methyl}-2-(phenylethynyl)-3,4-dihydronaphthalen-1(2H)-one and 2-benzyl-2-(phenylethynyl)-3,4-dihydronaphthalen-1(2H)-one in the presence of 5 mol % of (Ph3P)AuCl and 5 mol % of AgOTf in THF at 50 °C gave 2-1-(4-methoxyphenylmethyl)naphthalen-2-yl}-1-(4-methoxyphenyl)ethanone and 2-(1-benzylnaphthalen-2-yl)-1-phenylethanone in
金催化的2-炔基-1-四氢萘酮的异构化以良好或高收率提供了相应的2-萘基甲基酮。例如,2- 4-(甲氧基苯基)甲基} -2-(苯基乙炔基)-3,4-二氢萘-1(2H)-一与2-苄基-2-(苯基乙炔基)-3,4-的反应二氢萘-1(2H)-一在5摩尔%(Ph 3 P)AuCl和5摩尔%AgOTf在THF中于50°C存在下得到2- 1-(4-(甲氧基苯基甲基)萘-2-基} -1-(4-甲氧基苯基)乙酮和2-(1-苄基萘-2-基)-1-苯基乙酮的产率分别为85%和96%。本反应通过[1,2]烷基迁移然后进行氧转移进行。