Asymmetric Hydrocyanation of Nitroolefins Catalyzed by an Aluminum(III) Salen Complex
作者:Ajay Jakhar、Arghya Sadhukhan、Noor-ul H. Khan、S. Saravanan、Rukhsana I. Kureshy、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1002/cctc.201402373
日期:2014.9
Chiral AlIII salen complexes were synthesized and used as catalysts for the asymmetric hydrocyanation of nitroolefins using 4‐phenylpyridine N‐oxide as an additive and trimethylsilyl cyanide (TMSCN) as a source of cyanide. An excellent yield of β‐nitronitrile (87 %) and enantioselectivity (90 %) were achieved if (2‐nitrovinyl)cyclohexane was used as a substrate at −15 °C in 16 h. To understand the
合成了手性Al III salen配合物,并使用4-苯基吡啶N-氧化物作为添加剂和三甲基甲硅烷基氰化物(TMSCN)作为氰化物来源,将其用作硝基烯烃不对称氢氰化的催化剂。如果将(2-硝基乙烯基)环己烷用作底物,在-15°C下16小时,可获得良好的β-腈(87%)和对映选择性(90%)。为了了解Al III salen络合物与添加剂的相互作用,NMR和IR光谱研究表明4-苯基吡啶N-氧化物既充当轴向配体,又有助于激活氰化物源TMSCN,从而提高了反应活性。基于光谱学研究提出了催化循环。