Cesium Fluoride-mediated Claisen Rearrangements of Phenyl Propargyl Ethers: Substituent Effects of an ortho-Alkoxy Group on the Benzene Ring or Modified Propargyl Residues
摘要:
The expected 7-alkoxy-2-methylbenzo [b]furans were effectively given in the CsF-mediated Claisen rearrangement of phenyl propargyl ethers with an o-alkoxy substituent on the benzene ring. On the other hand CsF did not affect the production of the corresponding benzo[b]furans when ethers, carrying a propargyl residue modified by either 1,1-dimethyl or 3-ethoxycarbonyl functions, were used as substrates in the rearrangement.
An efficient synthesis (yields >70%) of linear 7H-furo[3,2-g]chromen-7-one derivatives (psoralens or furocoumarins) has been carried out starting from ring-substituted 2-(coumarin-7-yl)oxyaldehydes; moreover, the phototoxicity of these compounds has been tested on a cultured cell line of murine fibroblast.
从环取代的2-(香豆素-7-基)开始,已经进行了线性7 H-呋喃[3,2 - g ] chromen-7-one衍生物(补骨脂素或呋喃香豆素)的有效合成(收率> 70%)。)乙醛; 此外,已经在鼠成纤维细胞的培养细胞系上测试了这些化合物的光毒性。