Formal Deoxygenative Hydrogenation of Lactams Using PN<sup>H</sup>P-Pincer Ruthenium Complexes under Nonacidic Conditions
作者:Osamu Ogata、Hideki Nara、Kazuhiko Matsumura、Yoshihito Kayaki
DOI:10.1021/acs.orglett.9b03878
日期:2019.12.20
amides to amines with RuCl2(NHC)(PNHP) (NHC = 1,3-dimethylimizadol-2-ylidene, PNHP = bis(2-diphenylphosphinoethyl)amine) is described. Various secondary amides, especially NH-lactams, are reduced with H2 (3.0-5.0 MPa) to amines at a temperature range of 120-150 °C with 1.0-2.0 mol % of PNHP-Ru catalysts in the presence of Cs2CO3. This process consists of (1) deaminative hydrogenation of secondary amides
描述了用RuCl2(NHC)(PNHP)(NHC = 1,3-二甲基亚甲基吲哚-2-亚基,PNHP =双(2-二苯基膦基乙基)胺)将酰胺进行正式的脱氧加氢成胺。在Cs2CO3存在下,在1.0-2.0 mol%的PNHP-Ru催化剂下,在120-150°C的温度范围内,用H2(3.0-5.0 MPa)将各种仲酰胺(尤其是NH-内酰胺)还原为胺。该方法包括(1)仲酰胺的脱氨基加氢生成伯胺和醇,(2)瞬态胺与醇的脱氢偶联生成亚胺,(3)亚胺的加氢生成形式上脱氧的仲胺产物。