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Liang, Ren‐Xiao; Song, Ling‐Jie; Lu, Jin‐Bo; Xu, Wei‐Yan; Ding, Chao; Jia, Yi‐Xia
Angewandte Chemie International Edition, March 22, 2021, Volume: 60, Issue: 13Journal Article
The extensively developed ene‐type enantioselective cycloisomerization of classical 1,n‐enynes provides an efficient approach to chiral cyclic 1,4‐dienes. In contrast, the catalytic asymmetric heteroarenyne (heteroarene–alkyne) cycloisomerization involving the dearomative transformation of endocyclic aromatic C=C bonds remains unknown. Herein, we communicate a PdH‐catalyzed enantioselective heteroarenyne cycloisomerization reaction of alkyne‐tethered indole substrates (formal 1,5‐ and 1,6‐enynes). Based on this strategy, a variety of structurally diverse chiral spiro and fused indoline derivatives bearing quaternary stereocenters and exocyclic C=C bonds are afforded in moderate to excellent yields and excellent enantioselectivities (up to 98 % ee). The classical ene‐type enantioselective 1,5‐enyne cycloisomerization of N‐vinylpropiolamides is also developed to afford chiral 2‐pyrrolones in good to excellent ee values. A palladium‐catalyzed enantioselective ene‐type cycloisomerization of heteroarenynes has been developed with alkyne‐tethered indoles as substrates. The reaction provides an efficient avenue for the synthesis of structurally diverse indolines bearing quaternary stereocenters in moderate to excellent yields and excellent enantioselectivities (up to 98 % ee).
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