The cationic rhodium/Binap system was found to be an efficient catalytic system for the [2 + 2 + 2] cycloaddition of prochiral triynes with internal alkynes. The optimization of the catalytic system allowed the construction of 1,1-disubstituted 1,3-dihydrobenzo[c]furans containing a quaternary carbon stereogenic centers in fair yields and moderate enantiomeric excesses.

中文翻译：

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铑催化的前手性三炔和内炔烃不对称合成1,1-二取代的1,3-二氢苯并[ c ]呋喃

发现阳离子铑/ Binap系统是前手性三炔与内部炔的[2 + 2 + 2]环加成反应的有效催化系统。催化系统的优化允许构建具有季碳立构中心的1,1-二取代的1,3-二氢苯并[ c ]呋喃，并具有合理的收率和适度的对映体过量。