The first catalytic desymmetric Friedländer condensation of 2-aminobenzophenone and prochiral cyclobutane-1,3-dione has been achieved using chiral phosphoric acid catalysis. A series of cyclobutanone-fused quinolines with quaternary stereogenic centres were obtained in up to 98% yield and 94% ee valve.

中文翻译：

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催化不对称弗里德兰德缩合构建具有四元立构中心的环丁酮稠合喹啉


使用手性磷酸催化实现了 2-氨基二苯甲酮和前手性环丁烷-1,3-二酮的首次催化不对称弗里德兰德缩合。获得了一系列具有四级立构中心的环丁酮稠合喹啉，收率高达 98%，ee 值高达 94%。