有机卤化物的催化羰基化是化学合成中重要的 CC 键形成。未活化烷基卤化物的羰基化仍然是一个挑战,目前需要在苛刻条件和高压 CO 下使用烷基碘。在此我们报告了钯催化的仲烷基溴烷氧基羰基化,在温和条件下在低压 (2 atm CO) 下进行. 初步机理研究与混合有机金属-自由基过程一致。这些反应有效地将未活化烷基溴的酯传递到各种底物上,并代表了烷基溴与一氧化碳的第一次催化羰基化。
DOI:
10.1021/jacs.6b04610
作为产物:
描述:
4-(1-Methyl-2-pyrryl)-but-3-en-2-one 在
钯 petrol 作用下,
以
乙酸乙酯 为溶剂,
反应 16.0h,
以to give 4-(1-Methyl-2-pyrryl)-butan-2-one (2.46 g)的产率得到4-(1-methyl-1H-pyrrol-2-yl)butan-2-one
Iodine-catalyzed efficient conjugate addition of pyrroles to α,β-unsaturated ketones
作者:Biswanath Das、Nikhil Chowdhury、Kongara Damodar
DOI:10.1016/j.tetlet.2007.02.094
日期:2007.4
Iodine was used as a catalyst for the conjugateaddition of pyrroles to α,β-unsaturated ketones at room temperature. Mono- and dialkylated products were obtained by using equimolar amounts of the reactants. However, the use of excess enones afforded only dialkylated products.
Synergic Interplay Between Halogen Bonding and Hydrogen Bonding in the Activation of a Neutral Substrate in a Nanoconfined Space
作者:Pellegrino La Manna、Margherita De Rosa、Carmen Talotta、Antonio Rescifina、Giuseppe Floresta、Annunziata Soriente、Carmine Gaeta、Placido Neri
DOI:10.1002/anie.201909865
日期:2020.1.7
The principle of amplified halogenbonding (XB) in a small space is exploited as a catalytic tool for the activation of an XB acceptor substrate in a nanoconfined environment. The inner cavity of the resorcinarene capsule has been equipped with an XB catalyst bearing an ammonium unit acting as a Trojan horse to drive the catalyst inside the capsule. In the presence of a specific XB catalyst, the capsule
Palladium-Catalyzed Alkoxycarbonylation of Unactivated Secondary Alkyl Bromides at Low Pressure
作者:Brendon T. Sargent、Erik J. Alexanian
DOI:10.1021/jacs.6b04610
日期:2016.6.22
Catalytic carbonylations of organohalides are important C-C bond formations in chemical synthesis. Carbonylations of unactivated alkyl halides remain a challenge and currently require the use of alkyl iodides under harsh conditions and highpressures of CO. Herein we report a palladium-catalyzed alkoxycarbonylation of secondary alkyl bromides that proceeds at low pressure (2 atm CO) under mild conditions
有机卤化物的催化羰基化是化学合成中重要的 CC 键形成。未活化烷基卤化物的羰基化仍然是一个挑战,目前需要在苛刻条件和高压 CO 下使用烷基碘。在此我们报告了钯催化的仲烷基溴烷氧基羰基化,在温和条件下在低压 (2 atm CO) 下进行. 初步机理研究与混合有机金属-自由基过程一致。这些反应有效地将未活化烷基溴的酯传递到各种底物上,并代表了烷基溴与一氧化碳的第一次催化羰基化。