作者:Chiaki Kuroda、Tadashi Ueshino、Shigenobu Honda、Hideyuki Suzuki
DOI:10.1055/s-2006-950264
日期:2006.10
A five-carbon ring-expansion reaction from a cyclohexane derivative fitted with a 3-hydroxy-2-silyloxyprop-1-en-1-yl unit in lieu of one of the C=C double bonds in the Cope rearrangement was studied to synthesize cycloundecanone derivatives. It was found that (E)-triethylsilyl enol ether is necessary for the reaction. The trans-isomer with respect to the cyclohexane ring afforded (2E,8E)-cycloundeca-2,8-dien-1-one, while its cis-isomer afforded (2E,8E)- and (2E,8Z)-isomers in a 1:3 ratio.
为了合成环十一酮衍生物,研究人员研究了环己烷衍生物的五碳环扩张反应,该反应在Cope重排中以3-羟基-2-硅氧基丙-1-烯-1-基单元代替了C=C双键之一。研究发现,反应需要(E)-三乙基硅烯醇醚。环己烷环的顺式异构体生成(2E,8E)-环十一-2,8-二烯-1-酮,而其顺式异构体生成(2E,8E)-和(2E,8Z)-异构体,比例为1:3。