Highly enantioselective (E >200) N-acylation of nine racemic primary amines with isopropyl methoxyacetate in the presence of Candida antarctica lipase B (Novozym 435) has been reported to yield the unreacted (S)-amines (ee ⩾98%) and produced the (R)-amides (ee ⩾95%) at 50% conversion under solvent-free conditions. One of the amines and the acyl donor have been used in an equimolar ratio at room temperature
据报道,在南极假丝酵母
脂肪酶B(Novozym 435)存在下,九种外消旋
伯胺与
甲氧基乙酸异丙酯的高对映选择性(E > 200)N-酰化反应会产生未反应的(S)-胺(ee⩾98%),并产生(R)-酰胺(ee⩾95%)在无溶剂条件下的转化率为50%。胺和酰基供体之一已在室温(23°C)下以等摩尔比使用。在反应条件下,已证明Novozym 435与1-苯基
乙胺(作为模型化合物)的重用稳定性差,而内部制备的溶胶-凝胶CAL-B催化剂的稳定性有所改善。