An Alkyne Hydroacylation Route to Highly Substituted Furans
作者:Philip Lenden、David A. Entwistle、Michael C. Willis
DOI:10.1002/anie.201105795
日期:2011.11.4
More rings for your rhodium: Rhodium‐catalyzed intermolecularalkynehydroacylations deliver γ‐hydroxy‐α,β‐enones, which can be cyclized in situ to deliver di‐ and trisubstituted furans. Functionalization of the intermediates using Heck chemistry allows the formation of regioisomeric furans. The use of an alternative RhI catalyst delivers 1,4‐dicarbonyl compounds and hence pyrroles, thiophenes, and
The Key Role of the Nonchelating Conformation of the Benzylidene Ligand on the Formation and Initiation of Hoveyda-Grubbs Metathesis Catalysts
作者:Bartosz Bieszczad、Michał Barbasiewicz
DOI:10.1002/chem.201501959
日期:2015.7.13
Experimental studies of Hoveyda–Grubbsmetathesiscatalysts reveal important consequences of substitution at the 6‐position of the chelating benzylideneligand. The structural modification varies conformational preferences of the ligand that affects its exchange due to the interaction of the coordinating site with the ruthenium center. As a consequence, when typical S‐chelated systems are formed as
作者:Sarah-Jane Poingdestre、Jonathan D. Goodacre、Andrew S. Weller、Michael C. Willis
DOI:10.1039/c2cc32713a
日期:——
The use of the electron-rich diphosphine ligand, dcpe, allows the efficient and highly linear selective hydroacylative coupling of aldehydes, including aryl examples, with a range of alkynes.
One-Pot Synthesis of 2-Sulfonamidobenzo[b]thiophenes Enabled by a Mild Protonative Activation of Ynamides
作者:Hee Nam Lim、Hyun-Suk Yeom、Solbin Kim、So Yeun Lim、Kihun Kwak
DOI:10.1055/a-1929-2650
日期:2022.12
ynamides containing an o-(methylthio)aryl group resulted in the one-pot formation of biologically important benzo[b]thiophenes. Compared with ynamide activation methods that use strong Brønsted acids or expensive transition metals, this protocol is mild and economical. Due to these merits, various functionalized 2-amidobenzo[b]thiophenes were furnished in a convenient way.
硅胶促进或溶剂促进含有邻-(甲硫基)芳基的ynamides的质子分子内环化导致一锅法形成生物学上重要的苯并[ b ]噻吩。与使用强布朗斯台德酸或昂贵的过渡金属的 ynamide 活化方法相比,该协议温和且经济。由于这些优点,各种官能化的2-氨基苯并[ b ]噻吩以方便的方式提供。
Rhodium(III)‐Catalyzed Aldehyde C−H Activation and Functionalization with Dioxazolones: An Entry to Imide Synthesis
A rhodium(III)-based catalytic system has been used to develop a C−H bond activation of benzaldehyde derivatives and subsequent functionalization with dioxazolones in order to afford imides. The importance of the nature of the directing group to perform selectively the aldehydic C−H bond activation has been highlighted. The scope investigation showed that this transformation could be applied to various