Synthesis of 8-carbo substituted 2-(trifluoromethyl)-4H-furo[2,3-h]chromen-4-ones and their thienoangelicin derivatives
作者:Temitope O. Olomola、Malose J. Mphahlele
DOI:10.1016/j.jfluchem.2019.109395
日期:2020.1
spectroscopic techniques, and confirmed by single X-ray crystal structures of 8-(3-fluorophenyl)-2-(trifluoromethyl)-4H-furo[2,3-h]chromen-4-one (2b) and 2-phenyl-7-(trifluoromethyl)-7,8-dihydro-5H-furo[2,3-h]thieno[2,3-c]chromen-5-one (3a). The highlight of this investigation is the conversion of 2-(trifluoromethyl)–substituted 4H-furo[2,3-h]chromen-4-ones into trifluoromethyl–substituted thienoangelicin analogues
串联Sonogashira交叉偶联7-羟基-8-碘-2-(三氟甲基)铬-4--4-异环末端乙炔,得到8-碳取代的2-(三氟甲基)-4 H-呋喃[2,3] - ħ ]苯并吡喃-4-酮2A -我。后者在三乙胺的存在下与巯基乙酸甲酯反应,得到相应的7,8-二氢-5 H-呋喃[2,3- h ] thieno [2,3 - c ] chromen-5-one衍生物3a – i。使用NMR(1 H-,13 C和19F-),红外光谱和质谱技术,并通过8-(3-氟苯基)-2-(三氟甲基)-4 H-呋喃[2,3- h ] chromen-4-one的单X射线晶体结构证实(2b)和2-苯基-7-(三氟甲基)-7,8-二氢-5 H-呋喃[2,3- h ] thieno [2,3 - c ] chromen-5-one(3a)。这项研究的重点是将2-(三氟甲基)取代的4 H -furo [2,3 - h ] ch