Direct access to spirocycles by Pd/WingPhos-catalyzed enantioselective cycloaddition of 1,3-enynes

Long Li, Shan Wang, Pengfei Luo, Ran Wang, Zheng Wang, Xiaoguang Li, Yuhua Deng, Fangzhi Peng and Zhihui Shao ()
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Long Li: Yunnan University
Shan Wang: Yunnan University
Pengfei Luo: Yunnan University
Ran Wang: Yunnan University
Zheng Wang: Kunming Institute of Physics
Xiaoguang Li: Shenzhen University
Yuhua Deng: Yunnan University
Fangzhi Peng: Yunnan University
Zhihui Shao: Yunnan University

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Spirocycles play an important role in drug discovery and development. The direct, catalytic, and enantioselective synthesis of spirocycles from readily available starting materials and in an atom economic manner remains a highly sought-after task in organic synthesis. Herein, an enantioselective Pd-hydride-catalyzed cycloaddition method for the synthesis of spirocyclic compounds directly from two classes of commonly available starting materials, 1,3-enynes and cyclic carbon−hydrogen (C−H) bonds, is reported. The reactions employ a chiral Pd/WingPhos catalyst to both suppress the formation of bis-allenyl by-products and control the stereoselectivity. 1,3-Enynes are used as dielectrophilic four-carbon units in the cycloaddition reactions, which also enables an enyne substrate-directed enantioselectivity switch with good levels of stereocontrol. The present spirocycle synthesis tolerates a broad range of functional groups of 1,3-enyne substrates, including alcohols, esters, nitriles, halides, and olefins. A variety of diverse cyclic nucleophiles, including pharmaceutically important heterocycles and carbocycles, can be flexibly incorporated with spiro scaffolds.

Date: 2021
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DOI: 10.1038/s41467-021-25981-x

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