Rhodium-catalyzed oxidative cycloaddition of benzamides and alkynes via C-H/N-H activation.
Rhodium-catalyzed oxidative cycloaddition of benzamides and alkynes via C-H/N-H activation.
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DOI:
10.1021/ja103776u
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发表时间:
2010-08-04
影响因子:
15
通讯作者:
Rovis, Tomislav
中科院分区:
文献类型:
--
作者:
Hyster, Todd K.;Rovis, Tomislav
The oxidative cycloaddition of benzamides and alkynes has been developed. The reaction utilizes Rh(III) catalysts in the presence of Cu(II) oxidants, and is proposed to proceed by N-H metalation of the amide followed by ortho C-H activation. The resultant rhodacycle undergoes alkyne insertion to form isoquinolones in good yield. The reaction is tolerant of extensive substitution on the amide, alkyne and arene, including halides, silyl ethers, and unprotected aldehydes as substituents. Unsymmetrical alkynes proceed with excellent regioselectivity, and heteroaryl carboxamides are tolerated leading to intriguing scaffolds for medicinal chemistry. A series of competition experiments shed further light on the mechanism of the transformation and reasons for selectivity.
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