Heterocyclic Communications p. 449 - 452 (2008)
Update date:2022-09-26
Topics:
Truong, Phong
Kennedy, G. Davon
Vasquez, Pedro C.
Baumstark
Addition of methyl- or phenyllithium to 3,4,4,5-tetrasubstituted-4H- pyrazoles (1a-b) smoothly produced the extremely air-sensitive anions of 4,5-dihydro-3,4,4,5,5-pentasubstituted-1H-pyrazoles (2a-c) which were converted to the N-tosylated compounds 3a-c in low to very good yields by reaction with tosyl fluoride. The two-step process is a convenient one-pot route to 4,5-dihydro-N-tosyl-1H-pyrazoles.
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