Tridentate Directing Groups Stabilize 6-Membered Palladacycles in Catalytic Alkene Hydrofunctionalization
作者:Miriam L. O’Duill、Rei Matsuura、Yanyan Wang、Joshua L. Turnbull、John A. Gurak、De-Wei Gao、Gang Lu、Peng Liu、Keary M. Engle
DOI:10.1021/jacs.7b08383
日期:2017.11.8
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-homoallylamiries, under Pd(II) catalysis. In conjunction with previous findings, we demonstrate regiodivergent hydro-functionalization of 34Dutenoic 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.