Regioselective and Stereospecific Copper-Catalyzed Deoxygenation of Epoxides to Alkenes
作者:Jingxun Yu、Yu Zhou、Zhenyang Lin、Rongbiao Tong
DOI:10.1021/acs.orglett.6b02405
日期:2016.9.16
diazo malonate for chemo-/regioselective and stereospecific deoxygenation of various epoxides with tolerance of common functional groups (alkene, ketone, ester, p-methoxybenzyl, benzyl, tert-butyldimethylsilyl, and triisopropylsilyl). In particular, the unprecedented regioselectivity allowed for the first time monodeoxygenation of diepoxides to alkenyl epoxides. Density functional theory mechanistic studies
两种铜盐(Cu(CF 3 CO 2)2和IMesCuCl)被鉴定为是地球上丰富的,廉价的但有效的金属催化剂,与重氮丙二酸酯一起用于各种环氧化物的化学/区域选择性和立体定向脱氧反应,并具有常见的官能团耐受性(烯烃,酮,酯,对甲氧基苄基,苄基,叔丁基二甲基甲硅烷基和三异丙基甲硅烷基)。特别是,空前的区域选择性使二环氧化物首次单脱氧为烯基环氧化物。密度泛函理论的机理研究表明,脱氧是通过折叠游离的叶立德而发生的,不利于通过可能的氧杂环丁烷的环还原而产生的直观途径。