Titanocene-Catalyzed Cyclocarbonylation of <i>o</i>-Allyl Aryl Ketones to γ-Butyrolactones
作者:Natasha M. Kablaoui、Frederick A. Hicks、Stephen L. Buchwald
DOI:10.1021/ja970115b
日期:1997.5.1
A method for the transformation of o-allyl aryl ketones to γ-butyrolactones using a catalytic amount of Cp2Ti(PMe3)2 or Cp2Ti(CO)2 is described. This catalytic “hetero Pauson−Khand”-type process proceeds via the carbonylation of an oxatitanacycle followed by thermally-induced reductive elimination to form a γ-butyrolactone and to regenerate the catalyst. We have investigated the scope and limitations
描述了使用催化量的 Cp2Ti(PMe3)2 或 Cp2Ti(CO)2 将邻烯丙基芳基酮转化为 γ-丁内酯的方法。这种催化“杂Pauson-Khand”型过程通过氧杂钛环的羰基化,然后通过热诱导还原消除形成γ-丁内酯并使催化剂再生。我们研究了这种催化方法的范围和局限性。我们的结果与以下观点一致,即该催化循环的关键步骤是形成电荷转移复合物或涉及催化剂和底物之间的可逆电子转移。