Synthesis of 3-oxabicyclo[3,1,1]heptanes by rearrangement of 3-oxaspiro[3,3]heptanes
作者:W. P. Cochrane、P. L. Pauson、T. S. Stevens
DOI:10.1039/j39690002346
日期:——
tris(ethoxycarbonyl)methane yields diethyl carbonate and diethyl-2-oxaspiro[3,3]heptane-6,6-dicarboxylate (II). Reduction of this diester yields the corresponding diol (III), but longer reaction time leads to cleavage of the oxetan ring. When heated, or upon attempted acid hydrolysis, this diol (III) rearranges to the 3-oxabicyclo[3,1,1]heptane derivative (VI; X = OH) and similar rearrangement occurs with acetic anhydride
3,3-双(氯甲基)氧杂环丁烷与三(乙氧基羰基)甲烷反应,生成碳酸二乙酯和-2-乙基-2-氧杂螺[3,3]庚烷-6,6-二羧酸二乙酯(II)。该二酯的还原产生相应的二醇(III),但是更长的反应时间导致氧杂环丁烷环的裂解。加热时或尝试酸解时,该二醇(III)重排为3-氧杂双环[3,1,1]庚烷衍生物(VI; X = OH),乙酸酐或亚硫酰氯也会发生类似的重排。酸水解将二酯(II)转化为3,3-双(羟基甲基)环丁烷-1,1-二羧酸,该环迅速环化成其单内酯。