Palladium-Catalyzed Site-Selective C(sp<sup>3</sup>)–H Arylation of Phenylacetaldehydes
作者:Bo-Bo Gou、Hang-Fan Liu、Jie Chen、Ling Zhou
DOI:10.1021/acs.orglett.9b02650
日期:2019.9.6
describe a Pd-catalyzed selective C-H arylation reaction of phenylacetaldehydes using l-valine as the transient directing group. This process showed a broad substrate scope and excellent selectivity in which a ligand-controlled functionalization of the unactivated β-C(sp3)-H bond. In addition, enantioselective arylation of phenylacetaldehydes was preliminarily explored by utilizing a bulky chiral transient
Electroreductive formylation of activated alcohols<i>via</i>radical–polar crossover
作者:Jungtaek Kang、Heyjin Cho、Hyunwoo Kim
DOI:10.1039/d3cc01529g
日期:——
The direct synthesis of sterically hindered aldehydes is highly challenging. Herein, we report a direct approach to generate such compounds via electroreductive cleavage of the C(sp3)–O bond of activated alcohols. Under the established reaction conditions, benzylic radical intermediates were efficiently generated. A subsequent radical–polar crossover generated carbanions that further reacted with N
The Catalytic Asymmetric α-Benzylation of Aldehydes
作者:Benjamin List、Ilija Čorić、Oleksandr O. Grygorenko、Philip S. J. Kaib、Igor Komarov、Anna Lee、Markus Leutzsch、Subhas Chandra Pan、Andrey V. Tymtsunik、Manuel van Gemmeren
DOI:10.1002/anie.201306037
日期:2014.1.3
AbstractThe first aminocatalyzed α‐alkylation of α‐branched aldehydes with benzyl bromides as alkylating agents has been developed. Using a sterically demanding proline derived catalyst, racemic α‐branched aldehydes are reacted with alkylating agents in a DYKAT process to give the corresponding α‐alkylated aldehydes with quaternary stereogenic centers in good yields and high enantioselectivities.