A new [3 + 4] cycloaddition of azaoxyallyl cations and anthranils has been achieved for rapid access to multisubstituted benzodiazepine derivatives. A variety of anthranils and α-halo hydroxamates were both effective substrates with simple operations under transition-metal-free conditions. The intriguing features of this method include its mild nature of the reaction conditions, high efficiency, broad
A copper-catalyzed acylhalogenation reaction of 3-methylanthranils with acidhalides, which utilizes the acyl halide as both the acylating and halogenating source, is described. This process involves N−O/C−H/C−X bond cleavages and C−N/C−X bond formations to furnish N-(2-(2-haloyl)phenyl)amides. Furthermore, this difunctional conversion using the N−O bond and oxygen as oxidants displays good tolerance
Rh(II)-Catalyzed Transannulation of <i>N</i>-Sulfonyl-1,2,3-Triazoles with 2,1-Benzisoxazoles or 1,2-Benzisoxazoles
作者:Xiaoqiang Lei、Mohan Gao、Yefeng Tang
DOI:10.1021/acs.orglett.6b02454
日期:2016.10.7
A Rh(II)-catalyzed transannulation of N-sulfonyl-1,2,3-triazoles with 2,1-benzisoxazoles has been developed, which affords an efficient method for the synthesis of quinazoline derivatives. The transformation represents an unprecedented example which utilizes N-sulfonyl-1,2,3-triazole as an aza-[2C]-component in cycloadditions. Meanwhile, a Rh(II)-catalyzed formal [3 + 2] cycloaddition of N-sulfonyl-1,2,3-triazoles with 1,2-benzisoxazoles is also presented, which enables the rapid synthesis of functionalized imidazole derivatives.