Stereoselective synthesis of alcohols. Part LV. Domino hydroformylation-allylboration-hydroformylation reactions to give trans-perhydropyrano[3,2-b]pyridine derivatives
Stereoselective synthesis of alcohols. Part LV. Domino hydroformylation-allylboration-hydroformylation reactions to give trans-perhydropyrano[3,2-b]pyridine derivatives
Vinylidenation of Organoboronic Esters Enabled by a Pd‐Catalyzed Metallate Shift
作者:Mark D. Aparece、Chenpeng Gao、Gabriel J. Lovinger、James P. Morken
DOI:10.1002/anie.201811782
日期:2019.1.8
Organoboron "ate" complexes undergo a net vinyl insertion reaction to give 1,1-disubstituted alkenyl boronic esters when treated with stoichiometric allylacetate and a palladium catalyst. Reactions that employ vinyllithium afforded good to excellent yields after one hour, while reactions that employ vinylmagnesium chloride furnished modest to good yields after 18 hours.
Pd-Catalyzed Conjunctive Cross-Coupling between Grignard-Derived Boron “Ate” Complexes and C(sp<sup>2</sup>) Halides or Triflates: NaOTf as a Grignard Activator and Halide Scavenger
作者:Gabriel J. Lovinger、Mark D. Aparece、James P. Morken
DOI:10.1021/jacs.6b12663
日期:2017.3.1
Catalytic enantioselectiveconjunctivecross-couplings that employ Grignard reagents are shown to furnish an array of nonracemic chiral organoboronic esters in an efficient and highly selective fashion. The utility of sodium triflate in facilitating this reaction is two-fold: it enables "ate" complex formation and overcomes catalytic inhibition by halide ions.
Palladium-Catalyzed Conjunctive Cross-Coupling with Electronically Asymmetric Ligands
作者:Chenpeng Gao、Christopher A. Wilhelmsen、James P. Morken
DOI:10.1021/acs.joc.2c02341
日期:2023.2.3
Palladium-catalyzed conjunctive cross-coupling can be accomplished with the use of chiral phosphine-oxazoline based ligand structures. Of note, the reaction can be conducted on Grignard-based boron ate complexes and operates without the use of halide-scavenging additives, which are required for other catalyst systems.
Domino-Hydroformylation-Allylboration-Hydroformylation for the Synthesis of trans-2-Alkylpiperidin-3-ols
作者:Reinhard W. Hoffmann、David Brückner、Vincent J. Gerusz
DOI:10.3987/com-99-s39
日期:——
Stereoselective synthesis of alcohols. Part LV. Domino hydroformylation-allylboration-hydroformylation reactions to give trans-perhydropyrano[3,2-b]pyridine derivatives
作者:Reinhard W. Hoffmann、David Brückner
DOI:10.1039/b009259m
日期:——
N-Allyl-(E)-γ-aminoallyl boronates 8 and 18, when subjected to hydroformylation conditions, enter into a domino hydroformylation-allylboration-hydroformylation reaction cascade to generate the bicyclic N,O-heterocycles 12 and 20. On reaction
of the methallyl compound 8b a stereogenic center is generated in the initial hydroformylation, which
controls the relative configuration
of the two new stereogenic centers resulting from the allylboration reaction.