Synthesis of linear 3-phenylpyranocoumarins: synthesis of robustin, robustic acid, and their methyl ethers
作者:Vinod K. Ahluwalia、Chandra Prakash、Ravinder S. Jolly
DOI:10.1039/p19810001697
日期:——
The linear 3-phenylpyranocoumarins, viz., robustin (5b; R4= H), its methyl ether (5b; R4= Me), robustic acid (5c; R4= H), its methyl ether (5c; R4= Me), 4-methoxy-3-phenylxanthyletin (5a; R4= H), and its methyl ether (5a; R4= Me), have been synthesised starting from the corresponding 7-(1,1-dimethylprop-2-ynyloxy)-coumarin derivatives having the 8-position blocked with an easily introduceable and removable
线性3-苯基吡喃香豆素,即。,健壮素(5b; R 4 = H),其甲基醚(5b; R 4 = Me),健壮酸(5c; R 4 = H),其甲基醚(5c; R 4 = Me),4-甲氧基-从相应的7-(1,1-二甲基丙-2-炔氧基)-香豆素衍生物开始合成了3-苯基黄嘌呤(5a; R 4 = H)及其甲基醚(5a; R 4 = Me)。 8位位置被易引入和可移动的基团(如碘)所封闭。后续步骤包括在NN中加热丙-2-炔基醚-二甲基苯胺,其导致环化为线性吡喃香豆素,伴随着碘的去除以及4-位甲氧基的部分去甲基化。获得的化合物与天然样品相同,并且与相应的角异构体的真实样品不同。