双环[2.2.1]庚-2-胺是一种有机中间体,可以通过降冰片烯或降冰片醇为原料制备。它主要用于合成降冰片烷异氰酸酯。
制备步骤 步骤1在氮气保护下,将500 mL三口瓶中依次加入5-1 (20 g)、乙醇(250 mL)、盐酸羟胺(16 g)和吡啶(18.6 g),升温至80℃反应过夜。降至室温后,加入200 mL水进行萃取(使用乙酸乙酯,共3次,每次200 mL),然后用500 mL盐水洗涤五次。有机相经无水硫酸钠干燥后浓缩得到产物5-2。
步骤2同样在氮气保护下,将500 mL三口瓶中加入5-2 (18 g)和四氢呋喃(500 mL),降温至0℃,分批加入氢化铝锂(16 g)。反应完全后,在室温条件下继续反应过夜。随后,将温度降至0℃,逐步滴加16 mL水,并用1 N的氢氧化钠溶液调节pH值至7。再添加16 mL水,并用200 mL二氯甲烷萃取分层。有机相经无水硫酸钠干燥后浓缩得到产物5-3。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
外-2-去甲冰片基异硫氰酸 | exo-2-norbornyl isothiocyanate | 14370-23-1 | C8H11NS | 153.248 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2-Methylamino-bicyclo<2.2.1>-heptan | 42870-62-2 | C8H15N | 125.214 |
—— | N,N-dimethylnorbornan-2-exo-amine | —— | C9H17N | 139.241 |
2-(双环[2.2.1]庚-2-基氨基)乙醇 | S-2-(2-Norbornylamino)ethanol | 37031-10-0 | C9H17NO | 155.24 |
The biocatalytic performance of a cloned cyclohexylamine oxidase derived from Brevibacterium oxydans IH-35A towards structurally different amines was investigated. Cycloalkyl primary amines, alkyl aryl amines, and α-carbon-substituted aliphatic amines were identified as suitable substrates for the biocatalyst based on an activity assay. Kinetic resolutions of several amines by either recombinant whole cells or crude enzyme extracts prepared therefrom gave enantiomerically pure (R)-amines besides the corresponding ketones. When cyclohexylamine oxidase in combination with a borane–ammonia complex as reducing agent was applied to the deracemization of several substrates, excellent enantiomeric ratios (>99:1) and good isolated yields (62%–75%) of the corresponding (R)-amines were obtained.