Reductive coupling of isatins with ketones and aldehydes by low-valent titanium
作者:Naoki Kise、Kouta Sasaki、Toshihiko Sakurai
DOI:10.1016/j.tet.2014.10.071
日期:2014.12
The reductivecoupling of isatins with ketones and aldehydes by Zn–TiCl4 in THF gave two- and four-electron reduced products, 3-hydoxy-3-(1-hydoxyalkyl)oxindoles and 3-alkylideneoxindoles, selectively by controlling the reaction conditions. Although the 3-(1-hydoxyalkyl)oxindoles were also produced as the four-electron reduced products in some cases, these products were readily dehydrated to 3-alkylideneoxindoles