One‐Step Synthesis of 2,5‐Diaminoimidazoles and Total Synthesis of Methylglyoxal‐Derived Imidazolium Crosslink (MODIC)
作者:Venkata R. Sabbasani、Kung‐Pern Wang、Matthew D. Streeter、David A. Spiegel
DOI:10.1002/anie.201911156
日期:2019.12.19
compounds spontaneously adopt the non-aromatic 4(H) tautomer. The reaction works successfully on both cyclic and acyclic amino ketone starting materials, as well as a range of substituted guanylhydrazines. Following optimization, the method was applied to the efficient synthesis of the advanced glycation end product (AGE) methylglyoxal-derived imidazolium crosslink (MODIC). We expect that this method
Asymmetric Synthesis of a Key Intermediate for Tofacitinib via a Dynamic Kinetic Resolution-Reductive Amination Protocol
作者:Gerard K. M. Verzijl、Christian Schuster、Thomas Dax、André H. M. de Vries、Laurent Lefort
DOI:10.1021/acs.oprd.8b00332
日期:2018.12.21
example of a catalytic asymmetric reductive amination under dynamic kinetic resolution (DKR) conditions for the preparation of a chiral amine as a keyintermediate toward Tofacitinib, an active pharmaceutical ingredient developed by Pfizer. Such a protocol allows the preferential formation of a single product out of four possible diastereomers of the chiral amine starting from the corresponding racemic
stereogenic centers associated to the piperidine ring. In this study, an enzymatic dynamic kinetic resolution-asymmetric reductive amination was developed to prepare enantiomerically complementary cis-1-benzyl-N,4- dimethylpiperidin-3-amine and its analogues. Two enantiocomplementary imine reductases (IREDs) were identified for the synthesis of (3R,4R)- and (3S,4S)-1-benzyl-N,4-dimethylpiperidin-3-amine in
托法替尼是一种口服蛋白酪氨酸激酶抑制剂,被批准用于治疗类风湿性关节炎、活动性银屑病关节炎和溃疡性结肠炎。由于与哌啶环相关的两个连续立体中心,其高效生产仍然是一个挑战。本研究开发了一种酶动力学动力学拆分-不对称还原胺化制备对映体互补的顺式-1-苄基-N ,4-二甲基哌啶-3-胺及其类似物。两种对映互补亚胺还原酶 (IRED) 被鉴定用于合成 (3 R ,4 R )- 和 (3 S ,4 S )-1-苄基-N,4-二甲基哌啶-3-胺具有高分离产率(83% 和 91%),具有出色的立体选择性(97% 和 >99% ee值)和非对映选择性(>99:1 dr),为生产托法替尼的关键中间体。