Synthesis of Trifunctionalized Naphtho[1,2-<i>b</i>]furans Based on the Strategy for the Construction of Both Furan and Naphthalene Cycle
作者:Shanjian Mao、Yinbo Wan、Haiyun Peng、Li Luo、Guisheng Deng
DOI:10.1021/acs.joc.9b00058
日期:2019.5.3
available conjugated diazo ene-yne-ketones under O2 atmosphere led to the formation of diazo trisubstituted furans. The Rh2(OAc)4-mediated selective C(sp2)–H insertion at the ortho-position of 2-aryl group (R1) of the furan moiety under N2 atmosphere occurred to construct naphthalene cycle, affording trifunctionalized naphtho[1,2-b]furans. C(sp2)–H insertion at the 4-position of the furan ring, and Wolf rearrangement
Andreichikov, Yu.S.; Gein, L.F.; Gein, V.L., Journal of Organic Chemistry USSR (English Translation), 1981, vol. 17, p. 545 - 550
作者:Andreichikov, Yu.S.、Gein, L.F.、Gein, V.L.
DOI:——
日期:——
Chemistry of Diazopolycarbonyl Compounds: VIII. Synthesis of Nitrogen-containing Heterocycles via Transformations of Substituted 2-diazopentane-1,3,5-triones
作者:N. V. Kutkovaya、N. G. Vyaznikova、V. V. Zalesov
DOI:10.1023/b:rujo.0000013140.10977.7f
日期:2003.11
Ethyl 5-aryl-2-diazo-3,5-dioxopentanoates and 1,5-diaryl-2-diazopentane-1,3,5-triones are partially enolized in solutions. By O-methylation of enol forms of diazo esters with diazomethane ethyl 5-aryl-2-diazo-5-methoxy-3-oxopent-4-enoates were prepared. Concurrently with the O-methylation the diazo esters undergo heterocyclization into 3,5-disubstituted 4-hydroxypyrazoles which under the reaction condition suffer O- and N-methylation by excess diazomethane. 3,5-Diaroyl-4-hydroxypyrazoles were also obtained from diazopentanetriones but here triethylamine served as the cyclization reagent.