A Highly Chemoselective and Practical Alkynylation of Thiols
摘要:
A thiol-alkynylation procedure utilizing the hypervalent iodine alkyne transfer reagent TIPS-ethynyl-benziodoxolone has been developed. This scalable reaction proceeds in five minutes at room temperature in an open flask using commercially available reagents. The scope of the reaction is broad, with a variety of phenolic, benzylic, heterocyclic, and aliphatic thiols undergoing alkynylation in excellent yield. The method is highly chemoselective as a vast array of functional groups are tolerated. The utility of the thiol-alkynylation in postsynthetic elaboration has been demonstrated through the facile installment of a fluorophore tag on a cysteine-containing peptide.
The present invention provides compounds and compositions thereof which are useful as inhibitors of plasma kallikrein and which exhibit desirable characteristics for the same.
Preparation of novel antibacterial agents. Replacement of the central aromatic ring with heterocycles
作者:Jianke Li、Brian D. Wakefield、J. Craig Ruble、Cory M. Stiff、Donna L. Romero、Keith R. Marotti、Michael T. Sweeney、Gary E. Zurenko、Douglas C. Rohrer、Atli Thorarensen
DOI:10.1016/j.bmcl.2006.12.055
日期:2007.4
Discovery of novel antibacterial agents is a significant challenge. We have recently reported on our discovery of novel antibacterial agents in which we have rapidly optimized potency utilizing a parallel chemistry approach. These advanced leads suffer from high affinity for human serum albumin (HSA). In an effort to decrease the affinity for HSA we have prepared a series of heterocyclic analogs, which
Synthesis of Isothiochroman-3-ones via Metal-Free Oxidative Cyclization of Alkynyl Thioethers
作者:Ying-Qi Zhang、Xin-Qi Zhu、Yang-Bo Chen、Tong-De Tan、Ming-Yang Yang、Long-Wu Ye
DOI:10.1021/acs.orglett.8b03462
日期:2018.12.7
A novel Brønsted acid-catalyzed oxidative C–H functionalization of alkynyl thioethers has been developed. This method allows the practical synthesis of valuable isothiochroman-3-ones in mostly moderate to good yields under mild reaction conditions and features a broad substrate scope and wide functional group tolerance. Moreover, this metal-free oxidation can also be used to promote formal N–H insertion
methods for the convergent synthesis of (poly)cyclic scaffolds are urgently needed in synthetic and medicinal chemistry. Herein, we describe new annulation reactions of thioalkynes with phthalimide‐substituted donor–acceptor cyclopropanes, which gave access to highly substituted cyclopentenes and polycyclic ring systems. With silyl‐thioalkynes, the Lewis acid catalyzed [3+2] annulation reaction with
A concise and efficient synthetic strategy to silyl-protected terminal alkynyl sulfides from alkyl or benzyl halides
作者:Kazem D. Safa、Maryam Alyari
DOI:10.1016/j.jorganchem.2015.01.012
日期:2015.4
A novel synthetic strategy to silyl-protected terminal alkynyl sulfides via reaction of lithium 2,2,2-tris(trimethylsilyl)ethanedithioate, produced by the reaction of tris(trimethylsilyl)methyllithium with carbon disulfide, and alkyl or benzyl halides has been developed. The scope of the reaction is broad, with a variety of benzylic and aliphatic halides and products were formed in good to excellent