cis-Dihydroxylation of Unsaturated Potassium Alkyl- and Aryltrifluoroborates
摘要:
The cis-dihydroxylation of olefin-containing potassium alkyl- and aryltrifluoroborates proceeds readily in moderate to excellent yields. The resulting diols are efficient coupling partners in Suzuki-Miyaura-type reactions with both alkenyl and aryl bromides.
cis-Dihydroxylation of Unsaturated Potassium Alkyl- and Aryltrifluoroborates
摘要:
The cis-dihydroxylation of olefin-containing potassium alkyl- and aryltrifluoroborates proceeds readily in moderate to excellent yields. The resulting diols are efficient coupling partners in Suzuki-Miyaura-type reactions with both alkenyl and aryl bromides.
Practical Photocatalytic Trifluoromethylation and Hydrotrifluoromethylation of Styrenes in Batch and Flow
作者:Natan J. W. Straathof、Sten E. Cramer、Volker Hessel、Timothy Noël
DOI:10.1002/anie.201608297
日期:2016.12.12
represent a challenging class of substrates for current radical trifluoromethylation and hydrotrifluoromethylation methods due to a myriad of potential side reactions. Herein, we describe the development of mild, selective and broadly applicable photocatalytic trifluoromethylation and hydrotrifluoromethylation protocols for these challenging substrates. The methods use fac‐Ir(ppy)3, visible light and
Synthesis and Applications of α-Trifluoromethylated Alkylboron Compounds
作者:O. Andreea Argintaru、DaWeon Ryu、Ioana Aron、Gary A. Molander
DOI:10.1002/anie.201308036
日期:2013.12.16
RBF3K is a chemist's BFF: A metal‐free synthetic route to unprecedented organoboron compounds bearing an α‐trifluoromethyl substituent, employing a variety of trifluoroborate (RBF3K) starting materials, is reported. These substrates represent the first isolated α‐trifluoromethylated alkylboron building blocks, and these reagents lead to a variety of useful bench‐stable, synthetic intermediates. Pin=pinacol
Abstract A facile new synthetic method for the preparation of a Type-A 1-arylnaphthalene lactone skeleton was developed and used to synthesise justicidin B and several derivatives. Key synthesis steps included Hauser–Kraus annulation of a phthalide intermediate and Suzuki–Miyaura cross coupling between a triflated naphthalene lactone intermediate and various potassium organotrifluoroborates. With two
摘要 开发了一种制备 A 型 1-芳基萘内酯骨架的简便新合成方法,并将其用于合成 justicidin B 和几种衍生物。关键的合成步骤包括苯酞中间体的 Hauser-Kraus 环化和三氟萘内酯中间体与各种有机三氟硼酸钾之间的 Suzuki-Miyaura 交叉偶联。除了两个例外,这些衍生物对脂多糖 (LPS) 诱导的小鼠巨噬细胞中一氧化氮 (NO) 的产生显示出显着的抑制作用。此外,包括 justicidin B 在内的几种化合物对六种人类肿瘤细胞系具有显着的细胞毒性。
Ozonolysis of Unsaturated Organotrifluoroborates
作者:Gary A. Molander、David J. Cooper
DOI:10.1021/jo070130r
日期:2007.4.1
withstanding ozonolysis of remote alkenes, thus providing a new route to oxo-substituted organotrifluoroborates. The primary ozonides initially generated upon ozonolysis can be reduced with Zn/AcOH to afford the carbonyl compounds. Alternatively, capture of the carbonyl oxides with either an appropriate N-oxide or H2O easily gives the desired oxo-substituted organotrifluoroborates. Both unsaturated alkyltrifluoroborates
Arylation and Heteroarylation of Thienylsulfonamides with Organotrifluoroborates
作者:Mnaza Noreen、Nasir Rasool、Mirna El Khatib、Gary A. Molander
DOI:10.1021/jo501323z
日期:2014.8.1
the Suzuki cross-coupling of unprotected thienylsulfonamides from air- and bench-stable organotrifluoroborates in the absence of a protecting group on the sulfonamide nitrogen. The developed synthetic method can be applied to the preparation of various arylated and heteroarylated thienylsulfonamides underconditions that are tolerant of a broad range of functional groups.