作者:Florian R. Kinzl、Herbert M. Riepl
DOI:10.1002/hlca.201400346
日期:2015.4
Diamines are useful as additional ligands in enantioselective hydrogenations. A new route for synthesizing such a rigid diamine from naturally available camphor via camphor oxime/camphor furoxan/deoxygenation in large scale was developed. The resulting dinitriles were subjected to hydrogenation with Raney Ni or other heterogenous catalysts. In most cases, the reduction resulted in complex mixtures
二胺可用作对映选择性氢化中的附加配体。开发了通过樟脑肟/樟脑呋喃/脱氧从天然樟脑中合成这种刚性二胺的新途径。将所得的二腈用阮内镍或其他非均相催化剂进行氢化。在大多数情况下,还原会产生复杂的混合物。在强碱性介质(NaOH)中的阮内镍在THF / H 2 O中获得最佳结果,该化合物只能以高收率获得化合物5b。均相催化剂(如第二代Grubbs)仅还原受阻较小的CN基团,生成氨基腈。