Halogen‐Bonding‐Induced Conjugate Addition of Thiophenes to Enones and Enals
作者:Yi‐Cen Ge、Hui Yang、Arne Heusler、Zhijie Chua、Ming Wah Wong、Choon‐Hong Tan
DOI:10.1002/asia.201900607
日期:2019.8
Herein, we report the conjugateaddition of α,β‐unsaturated carbonyl compounds to thiophene derivatives. We used a 2‐iodoimidazolinium triflate salt as a halogen‐bonding donor, which afforded moderate‐to‐excellent yields of the corresponding alkylated thiophenes. Insight into the catalytic process was obtained from 1H NMR spectroscopy studies and DFT calculations, which indicated a halogen‐bonding‐supported
在这里,我们报道了α,β-不饱和羰基化合物的共轭加成反应的噻吩衍生物。我们使用2-碘碘咪唑啉三氟甲磺酸盐作为卤素键供体,可提供中等至出色的相应烷基化噻吩收率。通过1 H NMR光谱学研究和DFT计算获得了对催化过程的深入了解,这表明在有限的布朗斯台德酸催化作用下卤素键合支持的机理。
Enantioselective rhodium-catalysed 1,4-additions of 2-heteroarylzinc donors using Me-DUPHOS
作者:Jérôme Le Nôtre、Joseph C. Allen、Christopher G. Frost
DOI:10.1039/b806098c
日期:——
The enantioselective 1,4-addition of 2-(substituted)thienylzinc and 2-furanylzinc reagents has been achieved (up to 99 : 1 er) using a complex derived from [Rh(C2H4)2Cl]2 and Me-DUPHOS.
Herein, we report a straightforward, environmentally friendly, and controllable palladium/ligand catalytic system to enable reductive/oxidative Heckreactions of cyclic enones with thiophene or furan derivatives via C-H activation. The key to this tunable reaction is the appropriate intercepting thienyl-Pd(II)-enolate during the enolization process. Such a controllable and economic protocol would not