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。
The elimination of carbon monoxide from acid derivatives. Part III. Planar carbonium ions as necessary intermediates
作者:David G. Pratt、Eugene Rothstein
DOI:10.1039/j39680002548
日期:——
Elimination of carbonmonoxidefromacid chlorides by the Friedel-Crafts reaction is precluded if the resulting carboniumions are restricted to non-planar geometry by bicyclic or other structures with a rigid molecular framework. In such cases the normal ketones are obtained.
Cyanothiophenes, their preparation and their use in pharmaceutical compositions
申请人:Anderskewitz Ralf
公开号:US20060094764A1
公开(公告)日:2006-05-04
The present invention relates to cyanothiophenes of general formula
wherein the Rs are defined as in the claims, the tautomers, their stereoisomers, the mixtures thereof and the salts thereof, which have valuable pharmacological properties, particularly a glugacon receptor-antagonistic activity.
Disclosed herein are KCNQ potassium channels modulators of formula (I)
wherein ring G
1
, X, R
1
, and R
2
are as defined in the specification. Compositions comprising such compounds; and methods for treating conditions and disorders using such compounds and compositions are also described.