Diverse cis-syn-cis and cis-anti-cis triquinane frameworks have been assembled by a simple synthetic protocol starting with substituted cage diones under microwave irradiation conditions. Thermal fragmentation of the cyclobutane ring play a key role in this process and milder reaction conditions have been employed in contrast to normal flash vacuum pyrolysis conditions. Here, thermal isomerization of the double bond has also been realized under the microwave irradiation conditions to afford the isomeric triquinanes at low temperature. These triquinane units are considered to be useful for the total synthesis of natural products and non-natural products containing fused cyclopentane rings.

中文翻译：

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通过光热复分解合成顺式-顺式-顺式和顺式-反式-线性三喹烷

多样的顺式-顺式和顺-反-顺triquinane框架已被组装通过启动用微波辐射的条件下被取代的笼二酮一个简单的合成方案。环丁烷环的热断裂在该过程中起关键作用，与正常的闪蒸真空热解条件相比，采用了较温和的反应条件。此处，还已经在微波辐射条件下实现了双键的热异构化，以在低温下提供异构体三喹烷。这些三喹烷单元被认为可用于含有稠合环戊烷环的天然产物和非天然产物的全合成。