A General C(sp3)–C(sp3) Cross-Coupling of Benzyl Sulfonylhydrazones with Alkyl Boronic Acids
摘要:
A general transition-metal-free cross-coupling between benzylic sulfonylhydrazones and 1 degrees, 2 degrees, or 3 degrees alkyl boronic acids is reported. The base-promoted reaction is operationally simple and exhibits a broad substrate scope to forge a variety of alkyl-alkyl bonds, including between sterically encumbered secondary and tertiary sp(3)-carbons. The ability of this method to simplify retrosynthetic analysis is exemplified by the improved synthesis of multiple medicinally relevant scaffolds.
This application relates to novel compounds of formula (I) (and their pharmaceutically acceptable salts), as defined herein, processes and intermediates for their preparation, pharmaceutical formulations comprising the novel compounds of formula (I), and the use of the compounds of formula (I) as thrombin inhibitors.
作者:Jacob R. Ludwig、Eric M. Simmons、Steven R. Wisniewski、Paul J. Chirik
DOI:10.1021/acs.orglett.0c02934
日期:2021.2.5
A cobalt-catalyzed method for the C(sp2)–C(sp3) Suzuki–Miyaura crosscoupling of aryl boronic esters and alkyl bromides is described. Cobalt–ligand combinations were assayed with high-throughput experimentation, and cobalt(II) sources with trans-N,N′-dimethylcyclohexane-1,2-diamine (DMCyDA, L1) produced optimal yield and selectivity. The scope of this transformation encompassed steric and electronic
描述了用于芳基硼酸酯和烷基溴的 C(sp 2 )-C(sp 3 ) Suzuki-Miyaura 交叉偶联的钴催化方法。通过高通量实验对钴-配体组合进行了分析,含有反式-N , N ' -二甲基环己烷-1,2-二胺 (DMCyDA, L 1 ) 的钴 (II) 源产生了最佳产率和选择性。这种转变的范围包括芳基硼酸亲核试剂上的空间和电子多样性以及亲电试剂上各种水平的支化和合成有价值的功能。自由基陷阱实验支持催化过程中亲电衍生自由基的形成。
Cobalt-Catalyzed C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Suzuki–Miyaura Cross-Coupling Enabled by Well-Defined Precatalysts with L,X-Type Ligands
作者:L. Reginald Mills、David Gygi、Jacob R. Ludwig、Eric M. Simmons、Steven R. Wisniewski、Junho Kim、Paul J. Chirik
DOI:10.1021/acscatal.1c05586
日期:2022.2.4
Cobalt(II) halides in combination with phenoxyimine (FI) ligands generated efficient precatalysts in situ for the C(sp2)–C(sp3) Suzuki–Miyaura cross-coupling between alkyl bromides and neopentylglycol (hetero)arylboronic esters. The protocol enabled efficient C–C bond formation with a host of nucleophiles and electrophiles (36 examples, 34–95%) with precatalyst loadings of 5 mol %. Studies with alkyl
The Merger of Benzophenone HAT Photocatalysis and Silyl Radical-Induced XAT Enables Both Nickel-Catalyzed Cross-Electrophile Coupling and 1,2-Dicarbofunctionalization of Olefins
作者:Alberto Luridiana、Daniele Mazzarella、Luca Capaldo、Juan A. Rincón、Pablo García-Losada、Carlos Mateos、Michael O. Frederick、Manuel Nuño、Wybren Jan Buma、Timothy Noël
DOI:10.1021/acscatal.2c03805
日期:2022.9.16
A strategy for both cross-electrophile coupling and 1,2-dicarbofunctionalization of olefins has been developed. Carbon-centered radicals are generated from alkyl bromides by merging benzophenone hydrogen atom transfer (HAT) photocatalysis and silyl radical-induced halogen atom transfer (XAT) and are subsequently intercepted by a nickel catalyst to forge the targeted C(sp3)–C(sp2) and C(sp3)–C(sp3)