[figure: see text] A phytotoxin, solanapyrone E, has been synthesized from the decalone prepared by the domino Michael reaction of the kinetic enolate of optically pure acetylcyclohexene with methyl crotonate. After several transformations on the decalone ring, condensation of a methyl acetoacetate equivalent installed a pyrone moiety and introduction of a hydroxymethyl unit into the pyrone ring furnished
[图:见正文]从光学上纯净的乙酰基环己烯的动力学烯醇化物与巴豆酸甲酯的多米诺米歇尔反应制得的十萘嵌苯醚中合成了一种植物毒素,索拉那酮E。在十溴环上进行几次转化后,乙酰乙酸甲酯等效物的缩合安装了一个吡喃酮部分,并将羟甲基单元引入到吡喃酮环中提供的solanapyrone E.
First Total Syntheses of the Phytotoxins Solanapyrones D and E via the Domino Michael Protocol
phytotoxins solanapyrones D (1) and E (2) have been synthesized from the decalone prepared by the domino Michaelreaction of the kinetic enolate of optically pure acetylcyclohexene with methylcrotonate. The decalone was transformed into a solanapyrone core by equilibration into thermodynamically stable trans-decalone (11), dehydroxylation, and dehydration. Condensation of a methyl acetoacetate equivalent