Pd-Catalyzed C–O Bond Formation Enabling the Synthesis of Congested <i>N</i>,<i>N</i>,<i>O</i>-Trisubstituted Hydroxylamines
作者:Jiaxing Chen、Yongzhuo Xu、Wen Shao、Jianhua Ji、Boqiang Wang、Muyang Yang、Guojiang Mao、Fuhong Xiao、Guo-Jun Deng
DOI:10.1021/acs.orglett.2c02975
日期:2022.11.18
A Pd-catalyzed C–O cross-coupling of O-acyl hydroxylamines and tertiary or secondary alkyl electrophiles was reported without the cleavage of the rather fragile N–O bond. The described strategy provides direct access to congested N,N,O-trisubstituted hydroxylamines bearing an α-quaternary carbon center under mild conditions in high yields and features exclusively chemoselective C–O bond formation,
alkyl halides with (hetero)aromaticamines represents an ideal means to afford enantioenriched N-alkyl (hetero)aromaticamines yet has remained unexplored due to the catalyst poisoning specifically for strong-coordinating heteroaromatic amines. Here, we demonstrate a copper-catalyzed enantioconvergent radical C(sp3)–N cross-coupling of activated racemic alkyl halides with (hetero)aromaticamines under
Asymmetric Suzuki Cross-Couplings of Activated Secondary Alkyl Electrophiles: Arylations of Racemic α-Chloroamides
作者:Pamela M. Lundin、Gregory C. Fu
DOI:10.1021/ja105148g
日期:2010.8.18
A nickel-catalyzed stereoconvergent method for the enantioselective Suzuki arylation of racemic alpha-chloroamides has been developed. This process provides a unique example of an asymmetric arylation of an alpha-haloamide, an enantioselective arylation of an alpha-chlorocarbonyl compound, and an asymmetric Suzuki reaction with an activated alkyl electrophile or an arylboron reagent. The method is also applicable to the corresponding enantioselective cross-coupling of alpha-bromoamides. The coupling products can be transformed without racemization into enantio-enriched alpha-arylcarboxylic acids and primary alcohols. A modest kinetic resolution of the alpha-chloroamide was observed; a mechanistic study indicated that the selectivity may reflect discrimination by the chiral catalyst of the two enantiomeric alpha-chloroamides in an irreversible oxidative-addition process.