作者:Anthony O'Sullivan、Norbert Bischofberger、Bruno Frei、Oskar Jeger
DOI:10.1002/hlca.19850680503
日期:1985.8.14
On flash vaccum thermolysis at temperatures between 390 and 585°, the epoxyenones 1–9 and the epoxydienes 10–12 undergo various types of reactions involving CC and/or CO bond cleavage in the oxirane ring. Thus, the compounds 1, 4–9, 11, and 12 were transformed to the divinyl ethers 13, 20, 21, 24, 25, 29, and 38 by a reversible [1,5] homosigmatropic H-shift. On thermolysis of the epoxides 1–12, several
上闪蒸真空热解在390和585之间的温度°时,epoxyenones 1 - 9和epoxydienes 10 - 12经受各种类型涉及CC和/或CO键断裂在环氧乙烷环反应。因此,化合物1,4 - 9,11,和12被变换到的二乙烯基醚13,20,21,24,25,29,和38由一个可逆[1,5] homosigmatropic H-移。关于环氧化物1的热解–参照图12,还分离了经由羰基-叶立德中间体形成的几种产物。叶立德产物的形成程度显然与环氧乙烷附近的官能团的结合能力有关。因此,环氧化物3,5,和7 - 10,轴承C(3)C(4)键,5-氧代功能,3,4-环氧或3,4-亚甲基基团,优选的反应后行经由羰基-叶立德中间体。作为进一步的反应途径中,环氧化物1 - 12经历的环氧乙烷,其中,但是,可以认为是酸催化的,而不是热反应的C-O键的断裂。