reaction. In this study, iterative evolution was performed to generate a LsAmDH mutant W5–5 (T123G/S157T/S275G), which was able to catalyze the reductive amination of 200 mM 4-methoxypropiophenone at 500 mM ammonium concentration to afford (R)-4-methoxyamphetamine with >99% ee and 90% isolated yield. This variant also catalyzed the reductive amination of other phenylacetone analogues with high yields and
安非他明及其类似物因其对大脑神经系统的强大而多样的作用而广泛应用于各种药物中,例如,( R )-4-甲氧基安非他明是治疗哮喘的福莫特罗的关键中间体。胺脱氢酶(AmDH)对酮进行生物催化还原胺化是合成手性伯胺的潜在方法,但通常需要高铵浓度来驱动胺化反应。在本研究中,通过迭代进化产生了Ls AmDH 突变体 W5–5 (T123G/S157T/S275G),它能够在 500 mM 铵浓度下催化 200 mM 4-甲氧基苯丙酮的还原胺化,得到 ( R )- 4-甲氧基苯丙胺,ee > 99%,分离收率 90%。该变体还催化其他苯丙酮类似物的还原胺化,在低铵浓度下具有高产率和优异的对映选择性。这将大大减少含铵废物的产生,使反应更加经济、更加绿色,为AmDHs的工业化应用奠定基础。
Synthesis of Primary sec-alkylamines via nucleophilic ring-opening of N-phosphorylated aziridines
3-Disubstituted N-phosphorylated aziridines except N-phosphorylated cyclohexenimine (4) do not react under the described conditions. Copper-mediated reaction of 2-phenyl-N-(diethoxyphosphoryl)aziridine (7) with Grignard reagents affords a mixture of regioisomers (8) and (9) but still with the preference of ring-opening at the carbon of lesser substitution.