Accessing ladder-shape azetidine-fused indoline pentacycles through intermolecular regiodivergent aza-Paternò–Büchi reactions by Jianjian Huang, Tai-Ping Zhou, Ningning Sun, Huaibin Yu, Xixiang Yu, Rong-Zhen Liao, Weijun Yao, Zhifeng Dai, Guojiao Wu, Fangrui Zhong

“…Here, we report intermolecular aza-[2 + 2] photocycloaddition (the aza-Paternò–Büchi reaction) of indole that facilely assembles planar building blocks into ladder-shape azetidine-fused indoline pentacycles with contiguous quaternary carbons, divergent head-to-head/head-to-tail regioselectivity, and absolute exo stereoselectivity. …”
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