Chromium-Catalyzed Radical Cyclization of Bromo and Chloro Acetals

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• 作者：K. Cory MacLeod ; Brian O. Patrick ; Kevin M. Smith
• 刊名：Organometallics
• 出版年：2010
• 出版时间：December 27, 2010
• 年：2010
• 卷：29
• 期：24
• 页码：6639-6641
• 全文大小：763K
• 年卷期：v.29,no.24(December 27, 2010)
• ISSN：1520-6041

文摘

Cyclopentadienyl chromium β-diketiminate catalysts are used for the radical cyclization of bromo and chloro acetals. Mn powder activated with PbBr₂ or PbCl₂ is the stoichiometric reductant, and γ-terpinene is the hydrogen atom donor. Although the primary cyclized product can be isolated and structurally characterized as the Cr(III) complex, this substrate can also be reduced catalytically under mild photolysis conditions.