trans Deformation of a carbon–carbon triple bond in response to incipient nucleophilic attack: the X-ray crystal structure of ethyl 3-(2-nitrophenyl)propynoate at 150 K
作者:Craig R. Rice、John D. Wallis
DOI:10.1039/c39930000572
日期:——
In the title compound 1 the electron-deficient alkyne bond shows a pronounced trans distortion in response to an adjacent electron rich nitro O atom, suggesting that the more favourable reaction coordinate for addition of nucleophiles to activated alkynes involves trans rather than cis addition.
Preparation of α-Bromoacrylates: One-Pot Procedure for the Synthesis of Conjugated Acetylenic Carboxylates from Aldehydes with Ph<sub>3</sub>P/Br<sub>3</sub>CCO<sub>2</sub>Et
作者:Doo Jang、Joong-Gon Kim、Dong Kang
DOI:10.1055/s-2008-1032070
日期:2008.2
established the optimal conditions for the Wittig reaction for synthesizing α-bromoacrylates with a high selectivity, and developed a simple and efficient one-pot procedure for preparing various conjugated acetylenic carboxylates in moderate to high yields.
TMSOTf-Catalyzed [4 + 2] Annulation of Ynamides and β-(2-Aminophenyl)-α,β-ynones for the Synthesis 2-Aminoquinolines
作者:Chaofan Qi、Xiaoxiao Shen、Wozheng Fang、Junbiao Chang、Xiao-Na Wang
DOI:10.1021/acs.orglett.4c00763
日期:2024.5.3
A metal-free TMSOTf-catalyzed [4 + 2] annulation of ynamides with β-(2-aminophenyl)-α,β-ynones enables the regiospecific and facile assembly of 2-aminoquinoline frameworks. The catalyst TMSOTf presented a remarkable advancement compared to previously reported transition-metal catalysts. A wide range of 3-aryl/alkyl-substituted 2-aminoquinolines were generated in moderate to excellent yields due to