Isotopically labeled amino acids are important for protein structure determination and in biosynthetic studies. We report now on the synthesis of (2S,3S)-4,4,4-[H-2(3)] valine (9) using a short, versatile, enzyme-free procedure. The deuterium label is introduced via an organocuprate opening of a chiral epoxide. (C) 1997 Elsevier Science Ltd.
Isotopically labeled amino acids are important for protein structure determination and in biosynthetic studies. We report now on the synthesis of (2S,3S)-4,4,4-[H-2(3)] valine (9) using a short, versatile, enzyme-free procedure. The deuterium label is introduced via an organocuprate opening of a chiral epoxide. (C) 1997 Elsevier Science Ltd.
Stereoselectivity and Substrate Specificity of the Fe(II)/α-Ketoglutarate-Dependent Oxygenase TqaL
catalyzes unusual aziridine formation from l-Val via cleavage of the unactivated Cβ–H bond. However, the mechanistic details as well as the synthetic potential of TqaL-catalyzed ring closure remain unclear. Herein, we show that the TqaL-catalyzed aziridination of l-Val proceeds with an atypical, mixed stereochemicalcourse involving both the retention and inversion of the C3(Cβ) stereocenter. It is also