已经制备了一对异构乙酰辅酶 A(乙酰辅酶 A)类似物,其中硫酯基团被仲醇取代。这两种异构体在仲醇的立体构型方面不同,旨在模拟乙酰辅酶 A 依赖性乙酰转移酶反应中四面体中间体或过渡态的两种可能构型。测试这两种异构体作为氯霉素乙酰转移酶和肉碱乙酰转移酶的抑制剂,这两种酶先前已被预测形成与 (S)-醇的构型匹配的四面体中间体。(S)-异构体是两种酶的更有效抑制剂,其 Ki 值比 (R)-异构体的 Ki 值低 12 倍和 6 倍。(S)-异构体也是更有效的磷酸乙酰转移酶抑制剂,乙酰辅酶A合成酶和芳胺乙酰转移酶,其四面体中间体的立体化学以前未知。这些结果表明...
Two chiral nitro alcohols, (S)-4-nitro-2-butanol and (S)-5-nitro-2-pentanol were prepared enantioselectively by reduction of the corresponding ketones with bakers' yeast.
Microbial reductions of beta- and gamma-nitroketones 1-3 with various yeast and mould species and strains is described. Enzyme mediated resolutions of the racemic beta- and gamma-nitro alcohols 4-6 and of their O-acetyl derivatives 4a-6a are also reported.