Hydrocarbon Surrogates for Organometallic Reagents: CuH-Catalyzed Stereoselective Addition from Olefins Richard Y. Liu, Yujing Zhou, Chengxi Li, Kwangmin Shin, Yang Yang, Erica Y. Tsai, and Stephen L. Buchwald Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, United States Ketone Addition Reactions Using Allene (C3H4) Allene: an Unexploited Feedstock Allene-Based Allylation: Extending the Scope Selected Applications Industrially Relevant Gas Mixtures Efficient Synthesis of an Anti-Psychotic Thioxanthene Drug Reactions of Substituted Allenes Stereochemical Model This research was supported by the National Institutes of Health under grants GM58160 and GM122483 and through a supplemental grant for a supercritical fluid chromatography (SFC) instrument. Y.Z. and R.Y.L. thank Bristol-Myers Squibb for support through fellowships. E.Y.T. thanks the National Science Foundation for financial support. We thank Nippon Chemical Industrial Co., Ltd., Solvias AG, Takasago Intl. Corporation, and MilliporeSigma for donations of ligands. References : Allene Gas: Liu, R. Y.*; Zhou, Y.*; Yang, Y.; Buchwald, S. L. J. Am. Chem. Soc. 2019, 141, 2251. Substituted Allenes: Tsai, E. Y.; Liu, R. Y.; Yang, Y.; Buchwald, S. L. J. Am. Chem. Soc. 2018, 140, 2007. Imines: Liu, R. Y.; Yang, Y.; Buchwald, S. L. Angew. Chem. Int. Ed. 2016, 55, 14077. Dienes + Ketones: Li, C.; Liu, R. Y.; Jesikiewicz, L. T.; Yang. Y.; Liu, P.; Buchwald, S. L. J. Am. Chem. Soc. 2019, 141, 5062. Dienes + Aldehydes: Li, C.; Shin, K.; Liu, R. Y.; Buchwald, S. L. Angew. Chem. Int. Ed. 2019, 131, 17230. Short Review: Liu, R. Y.; Buchwald, S. L. Acc. Chem. Res. 2020, 53, 1229. Regiodivergent Addition to Imines coordination to O promotes internal bond formation coordination to N promotes distal bond formation Design and Optimization 1,3-Dienes as Pronucleophiles Ketone Allylation Examples Organometallic Addition to Carbonyl Compounds Aldehyde Allylation Traditional, Two-Step Approach Our One-Step Approach n highly basic conditions, low tolerance for complex substrates n must control regio- and stereoselectivity for both steps n expensive or unstable intermediates n chiral controllers or specialized ligands required n stoichiometric metal waste n may generate insoluble salts n neutral conditions n catalyst-controlled regio- and stereoselectivity n no isolation of intermediates n Earth-abundant metal, commercially available ligands n cheap and environmentally benign silane reagent n fully homogeneous Precursor Organometallic Adduct Catalytic Intermediate (not isolated) Olefin