An efficient and divergent one-pot synthesis of α,α-dihaloamides from readily available β-oxoamides based on the selection of reaction conditions is reported. α,α-Dihalo-β-oxo amides were produced by treating β-oxoamides with N-chlorosuccinimide (NCS) or N-bromosuccinimide (NBS) in water at room temperature, whereas α,α-dihaloacetamides were synthesized by subjecting β-oxoamides to NCS or NBS in
alpha,alpha-Dihalo-N-arylacetamides are commonly used as intermediates in various organic reactions. In the study described here, a catalytic synthesis of alpha,alpha-dihalo-N-arylacetamides from beta-oxo amides was developed using zwitterionic catalysts and N-halosuccinimides as the halogen sources. The corresponding alpha,alpha-dihalo-N-arylacetamides were obtained in good to excellent yields, and no aromatic halogenated side products were detected. The reaction conditions were mild, and no strong base or acid was required.
Collet, Bulletin de la Societe Chimique de France, 1902, vol. <3> 27, p. 542
作者:Collet
DOI:——
日期:——
Organic synthesis using (diacetoxyiodo)benzene (DIB): Unexpected and novel oxidation of 3-oxo-butanamides to 2,2-dihalo-<i>N</i>-phenylacetamides
作者:Wei-Bing Liu、Cui Chen、Qing Zhang、Zhi-Bo Zhu
DOI:10.3762/bjoc.8.38
日期:——
cleavage of a carbon-carbon bond in the presence of DIB and a Lewis acid as the halogen source, and thus this method significantly expands the value of DIB as a unique and powerful tool in chemical synthesis. This protocol not only adds a new aspect to reactions that use other hypervalent iodine reagents but also provides a wide space for the synthesis of disubstituted acetamides.