(Dhb)-containing peptides. Biomimetic cyclization via Michael addition of Cys to a Dhb yielded the B-ring of the lantibiotic subtilin as a single diastereomer. The methyllanthionine product was shown to have the natural configuration by preparation of the authentic stereoisomer. The formation of a single isomer suggests that the prepeptide has a strong intrinsic preference for the stereochemistry observed in lantibiotics
Fmoc-(2R,3S)-3-甲基-Se-苯基
硒代半胱
氨酸用于合成含脱氢丁
氨酸(Dhb)的肽。通过将Cys迈克尔加成到Dhb上的仿生环化作用产生了羊毛
硫抗生素
枯草菌素的B环,为单个非对映异构体。通过制备真实的立体异构体,表明甲基羊毛
硫氨酸产物具有天然构型。单个异构体的形成表明,前肽对羊毛
硫抗生素中观察到的立体
化学具有强烈的内在偏好。[反应:看文字]