Rhenium- and manganese-catalyzedreactions between beta-keto esters and acetylenes, followed by treatment with tetrabutylammonium fluoride, gave 2-pyranone derivatives regioselectively.
β-酮酸酯和乙炔之间的R和锰催化反应,然后用氟化四丁基铵处理,区域选择性地生成2-吡喃酮衍生物。
Rhenium- and Manganese-Catalyzed Synthesis of Aromatic Compounds from 1,3-Dicarbonyl Compounds and Alkynes
作者:Yoichiro Kuninobu、Mitsumi Nishi、Atsushi Kawata、Hisatsugu Takata、Yumi Hanatani、Yudha S. Salprima、Aya Iwai、Kazuhiko Takai
DOI:10.1021/jo902072q
日期:2010.1.15
methylene moiety, and terminal alkynes. This reaction proceeds with high regioselectivity when aryl acetylenes are employed as the alkyne component. The second approach is a rhenium- or manganese-catalyzed formal [2+1+2+1] cycloaddition between β-keto esters and two kinds of alkynes. In this reaction, the aromatic compounds are obtained by the following reaction sequence: (1) insertion of the first alkyne
A reaction between a beta-keto ester and an acetylene in the presence of a rhenium complex, [ReBr(CO)(3)(thf)](2), as a catalyst, provided a 2-pyranone derivative in excellent yield via retro-aldol reaction (C-C single bond cleavage). By adding an acetylene-bearing ester group(s) after the formation of 2-pyranones, an aromatization reaction proceeded and multisubstituted aromatic compounds were obtained in good to excellent yields.
Zimmerman, Howard E.; Ramsden, William D., Canadian Journal of Chemistry, 1984, vol. 62, p. 2592 - 2611