peptide synthesis (SPPS). The robustness of the allenone-mediated peptide bond formation was showcased incisively by the synthesis of carfilzomib, which involved a rare racemization-/epimerization-free N to C peptide elongation strategy. Furthermore, the successful synthesis of the model difficult peptide ACP (65–74) on a solid support suggested that this method was compatible with SPPS. This method combines
Allenone 首次被鉴定为一种高效的肽偶联剂。肽键以α-羰基乙烯基酯为关键中间体形成,其形成和随后的氨解以无外消旋/差向异构化的方式自发进行。丙二烯酮偶联试剂不仅对简单酰胺和二肽的合成有效,而且还适用于肽片段缩合和固相肽合成 (SPPS)。卡非佐米的合成充分展示了丙二烯酮介导的肽键形成的稳健性,该合成涉及一种罕见的无消旋化/差向异构化的 N 到 C 肽延伸策略。此外,在固体支持物上成功合成模型困难肽 ACP (65-74) 表明该方法与 SPPS 兼容。该方法结合了传统活性酯和偶联剂的优点,同时克服了两种策略的缺点。因此,这种丙二烯酮介导的肽键形成策略代表了肽合成的颠覆性创新。
Visible Light‐Driven Efficient Synthesis of Amides from Alcohols using Cu−N−TiO
<sub>2</sub>
Heterogeneous Photocatalyst
作者:Krishnadipti Singha、Subhash Chandra Ghosh、Asit Baran Panda
DOI:10.1002/ejoc.202001466
日期:2021.1.26
practical method for direct amide synthesisfromalcohols and amines using an in situ generated active ester of N‐hydroxyimide with the earlier developed robust and recyclable Cu−N−TiO2 catalyst, at room temperature, using oxygen as a sole oxidant under visible light is discussed. The application of this amidation reaction has been successfully demonstrated for the synthesis of moclobemide, an antidepressant
A highly efficient, two-step, one-pot synthetic strategy for amides and peptides was developed by employing ynamides as novel couplingreagents under extremely mild reaction conditions. The ynamides not only are effective for simple amide and dipeptide synthesis but can also be used for peptide segment condensation. Importantly, no racemization was detected during the activation of chiral carboxylic
A Highly Efficient and Enantioselective Access to Tetrahydroisoquinoline Alkaloids: Asymmetric Hydrogenation with an Iridium Catalyst
作者:Mingxin Chang、Wei Li、Xumu Zhang
DOI:10.1002/anie.201104476
日期:2011.11.4
Efficient and enantioselective: Using the iodine‐bridged dimeric iridium complex [Ir(H)[(S,S)‐(f)‐binaphane]}2(μ‐I)3]+I− (1) a wide range of tetrahydroisoquinoline alkaloids, including the substructure of the pharmaceutical drug solifenacin, were obtained with excellent enantioselectivities and high turnover numbers (see scheme).
Studies on Cerebral Protective Agents. X. Synthesis and Evaluation of Anticonvulsant Activities for Novel 4,5,6,7-Tetrahydrothieno(3,2-c)pyridines and Related Compounds.
1-thienyl-1,2,3,4-tetrahydroisoquinolines and relatedcompounds, in which the benzene rings of (+)-1 (FR115427) were replaced with heteroaromatic rings such as thiophene, furan, benzothiophene and indole, were synthesized and evaluated for anticonvulsant activity against i.c.v. N-methyl-D-aspartate (NMDA)-induced seizures in mice. Among these compounds, (+)-4-methyl-4-phenyl-4,5,6,7-tetrahydrothieno[3