The ability of 2-ethoxybut-2-enal N,N-dimethylhydrazone to give with quinoline 5,8-diones or 1,4-naphtho-quinones, either a [4+2] cycloaddition in a neutral medium or a [3+2] process in the presence of trifluoroacetic acid is described. A 2D 1H-13C HMBC and 1D 1H NOE DIFF study is made in order to confirm the structures.
2-乙氧基丁-2-烯醛N,N-二甲基hydr与喹啉5,8-二酮或1,4-萘醌生成中性介质中[4 + 2]环加成或[3+]的能力[2]描述了在三氟乙酸存在下的方法。为了确定结构,进行了2D 1 H- 13 C HMBC和1D 1 H NOE DIFF研究。
Synthesis of Furonaphth(1,3)oxazine and Fur(1,3)oxazinoquinoline Derivatives as Precursors for an o-Quinonemethide Structure and Potential Antitumor Agents.
derivatives 3 was performed through a Mannich-typecondensation between 2-cyano-5-hydroxy-3-methylnaphtho[1,2]furan 2a, 1.5 eq of a primary amine and 3 eq of formaldehyde. Similarly, 2-cyano-5-hydroxy-3-methylfuro[2,3-f]quinoline 2b gave the dihydro furo[1,3]oxazino-quinoline compounds 4. Heating a mixture of the naphthofuran 2a, tert-butylamine and formaldehyde at toluene reflux led to the furonaphthoxazine