X-ray diffraction and VT-NMR studies of (E)-3-(piperidinyl)-1-(2′-hydroxyphenyl)-prop-2-en-1-one
作者:Seunghyun Choi、YunHye Kim、Bernie Byeonghoon Park、Suzie Park、Jonghyun Park、Kiwon Ok、JaeHyung Koo、Yong Woo Jung、Young Ho Jeon、Eun Hee Lee、Ken S. Lee、Youngjoo Byun
DOI:10.1016/j.molstruc.2014.08.016
日期:2014.11
commercial acetophenones in 2 or 3 steps. Compound 6, (E)-3-(piperidinyl)-1-(2′-hydroxyphenyl)-prop-2-en-1-one, exhibited the unique shape and intensity of the Csp2 N CH2 peaks in the 1H and 13C NMR spectra. Variable temperature (VT) nuclearmagneticresonance (NMR) and X-ray diffraction (XRD) studies of 6 revealed that the piperidine ring has a lower energy barrier to rotation than the 5-membered pyrrolidine
Michael-Aldol Double Elimination Cascade to Make Pyridines: Use of Chromone for the Synthesis of Indolizines
作者:Dirgha Raj Joshi、Ikyon Kim
DOI:10.1021/acs.joc.1c00981
日期:2021.8.6
having two different acyl groups at the C5 and C7 positions is described where chromone is employed as a two-carbon unit for the synthesis of a pyridine moiety for the first time. Various analogues were readily accessed in good yields under metal-free and eco-friendly conditions. Further manipulation of the resulting products allowed entry to novel indolizine-heterocycle adducts, which are difficult to
Selectfluor-Triggered Tandem Cyclization of <i>o</i>-Hydroxyarylenaminones To Access Difluorinated 2-Amino-Substituted Chromanones
作者:Qinglan Zhao、Haoyue Xiang、Jun-An Xiao、Peng-Ju Xia、Jun-Jie Wang、Xiaoqing Chen、Hua Yang
DOI:10.1021/acs.joc.7b01339
日期:2017.9.15
difluorinated 2-amino-substituted chromanones. This novel protocol features mild reaction conditions, operational simplicity, and broad substrate scope. The enamine moiety in o-hydroxyarylenaminone played dual roles to enable high efficiency in the difluorination and intramolecular cyclization, leading to the accomplishment of a new class of difluorinated 2-amino-substituted chromanones for pharmaceutical studies