Reaction of Benzyl Grignard Reagents with Trifluoroacetyldihydropyrans and Other Cyclic β-Alkoxy-α,β-Unsaturated Trifluoromethylketones
作者:Simon J Coles、John M Mellor、Afaf H El-Sagheer、Ezz El-Din M Salem、Reda N Metwally
DOI:10.1016/s0040-4020(00)00976-5
日期:2000.12
Benzyl Grignard reagents react with cyclic β-alkoxy-α,β-unsaturated trifluoromethyl ketones by 1,2-addition to afford unsaturated allylic alcohols in high yield. The factors determining the balance between 1,2- and 1,4-addition to unsaturated ketones are discussed. The structures of major and minor products are established by single crystal X-ray diffraction studies.
苄基格氏试剂通过加成1,2-与环状β-烷氧基-α,β-不饱和三氟甲基酮反应,以高收率得到不饱和烯丙基醇。讨论了确定不饱和酮中1,2-和1,4-加成之间平衡的因素。主要和次要产品的结构是通过单晶X射线衍射研究确定的。