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The first carbene-catalyzed asymmetric chemoselective cross silyl benzoin (Brook-Benzoin) reaction has been developed. Key steps of this reaction involve activation of the carbon-silicon bond of an acylsilane by a chiral N-heterocyclic carbene (NHC) catalyst to form a silyl acyl anion intermediate. These acyl anions then undergo an addition reaction with indole aldehydes in a highly chemo- and enantioselective manner to afford α-silyloxy ketones with excellent optical purities. The reaction mechanism of this cross Brook-Benzoin reaction was investigated through both experimental and computational methods. The chiral α-hydroxy ketone derivatives obtained by this approach show promising, agrochemically interesting activity against harmful plant bacteria. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Nanyang Technological University National Research Foundation (NRF) We acknowledge financial support from the Qiandongnan Science and Technology Plan Project (Qiandongnan kehejichu [2021]17), the Youth Science and Technology Talent Growth Program of Guizhou Province's Department of Education (Qian Jiaohe KY [2022]074), the National Natural Science Foundation of China (21961006, 22071036, 32172459), The 10 Talent Plan (Shicengci) of Guizhou Province ([2016]5649), the Science and Technology Department of Guizhou Province ([2019]1020, Qiankehejichu-ZK[2021]Key033), the Program of Introducing Talents of Discipline to Universities of China (111 Program, D20023) at Guizhou University, Frontiers Science Center for Asymmetric Synthesis and Medicinal Molecules, Department of Education, Guizhou Province [Qianjiaohe KY (2020)004], the Basic and Applied Research Foundation of Guangdong Province (2019A1515110906), the Guizhou Province First-Class Disciplines Project [(Yiliu Xueke Jianshe Xiangmu)-GNYL(2017)008], Guizhou University of Traditional Chinese Medicine, and Guizhou University (China). Singapore National Research Foundation under its NRF Investigatorship (NRF-NRFI2016-06), the Ministry of Education, Singapore, under its MOE AcRF Tier 1 Award (RG108/16, RG5/19, RG1/18), MOE AcRF Tier 3 Award (MOE2018-T3-1-003), the Agency for Science, Technology and Research (A*STAR) under its A*STAR AME IRG Award (A1783c0008, A1783c0010), GSK-EDB Trust Fund, Nanyang Research Award Grant, Nanyang Technological University. |
