Methyl 1-bromocyclohexanecarboxylate reacts with zinc in the presence of cyclohexanecarbonyl chloride to give methyl 1-(cyclohexylcarbonyl)cyclohexanecarboxylate. Treatment of the latter with bromine leads to formation of methyl 1-(1-bromocyclohexylcarbonyl)cyclohexanecarboxylate which reacts with zinc and aromatic aldehydes, yielding 16-aryl-15-oxadispiro[5.1.5.3]hexadecane-7,14-diones.
已经开发了两种合成乙烯酮烷基三烷基甲硅烷基缩醛(I)的通用方法。第一种通过二取代的丙二酸酯与钠/二甲苯的反应,另一种方法是通过使取代的乙酸酯的α-阴离子与三甲基氯硅烷反应。还制备了碳甲氧基乙烯酮甲基三甲基甲硅烷基乙缩醛(III)。二芳基乙烯酮甲基三甲基甲硅烷基乙缩醛的热解以良好的收率得到二芳基乙烯酮。该反应的机理已被确立为分子内采用18 O.烷基,芳基和二烷基烯酮methyltrimethylsilyl缩醛热解,得到烯酮烯酮缩醛加成化合物(II)。芳基烯缩醛(I)的光谱研究与偶极结构Ar 2 C -- C +一致(OMe)OSiMe 3。得出的一般结论是,围绕碳bond碳双键的旋转自由度由连接的取代基决定。光谱研究与其中甲氧甲氧基和三甲基甲硅烷基氧基为顺式的化合物(III)的通量行为一致。乙烯酮缩醛(I)大量断裂的结果与它们的热裂解相似。有趣的是,质谱仪中的乙烯酮-乙烯酮缩醛(II)被分解
The photochemicalringexpansion of dispirosubstitutedcyclobutane-1,3-diones in methanol has been investigated. The formation of ringexpansion product was strongly dependent on the spiro ring size of dispiro substituent. The ring expanded acetal was obtained in a low yield when the spiro ring of dispirosubstitutedcyclobutane-1,3-diones was a five- or seven-membered ring. This is the first example
Synthesis of 16-aryl-15-oxadispiro[5.1.5.3]hexadecane-7,14-diones by reformatsky reaction
作者:N. F. Kirillov、E. A. Nikiforova、A. N. Vasyanin、M. V. Dmitriev
DOI:10.1134/s1070428015040089
日期:2015.4
Methyl 1-bromocyclohexanecarboxylate reacted with zinc and aromatic aldehydes in two steps to afford 16-aryl-15-oxadispiro[5.1.5.3]hexadecane-7,14-diones; methyl 1-[aryl(hydroxy)methyl]cyclohexanecarboxylates were also formed as by-products.