Selective synthesis of 4-(sulfonyl)-methyl-1H-pyrazoles and (E)-4,5-dihydro-1H-pyrazoles from N-allenic sulfonylhydrazones.
Selective synthesis of 4-(sulfonyl)-methyl-1H-pyrazoles and (E)-4,5-dihydro-1H-pyrazoles from N-allenic sulfonylhydrazones with sulfonyl group migrations has been developed. A key feature of these reactions is that the migrations of the sulfonyl groups to different positions can be controlled by changing the Lewis acids.
Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China. zpzhan@xmu.edu.cn.
Yu
Y
Zhu
Jun-Jie
JJ
Hong
Yun-Bin
YB
Zhou
Yu-Wei
YW
Xiao
Min
M
Lin
Zhuang-Ping
ZP
Zhan
D002625:Chemistry, Organic / Q000379:methods*; D003500:Cyclization; D006835:Hydrazones / Q000138:chemical synthesis* / Q000737:chemistry; D011720:Pyrazoles / Q000138:chemical synthesis* / Q000737:chemistry
D006835:Hydrazones; D011720:Pyrazoles; C031280:pyrazole