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Tridentate Directing Groups Stabilize 6‑Membered Palladacycles in Catalytic Alkene Hydrofunctionalization

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journal contribution
posted on 03.10.2017, 00:00 by Miriam L. O’Duill, Rei Matsuura, Yanyan Wang, Joshua L. Turnbull, John A. Gurak, De-Wei Gao, Gang Lu, Peng Liu, Keary M. Engle
Removable tridentate directing groups inspired by pincer ligands have been designed to stabilize otherwise kinetically and thermodynamically disfavored 6-membered alkyl palladacycle intermediates. This family of directing groups enables regioselective remote hydrocarbofunctionalization of several synthetically useful alkene-containing substrate classes, including 4-pentenoic acids, allylic alcohols, homoallyl amines, and bis-homoallylamines, under Pd­(II) catalysis. In conjunction with previous findings, we demonstrate regiodivergent hydrofunctionalization of 3-butenoic acid derivatives to afford either Markovnikov or anti-Markovnikov addition products depending on directing group choice. Preliminary mechanistic and computational data are presented to support the proposed catalytic cycle.

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