N-Substituted Bromopyrazoles: Synthesis and 13C Nmr Study
摘要:
The synthesis of N-1 substituted 4-bromo-, 3,4-dibromo- and 3,4,5-tribromopyrazoles starting from the NH-pyrazoles is described. C-13 Nmr spectroscopic studies with the title compounds are presented, investigating the influence of substituents on C-13-chemical shifts and C-13, H-1 spin coupling constants.
the chemoselective mono- and diamination of ketoneusing pyrazole as the amine source in a combined copper–organocatalyst system. Various substrates are compatible, providing the corresponding products in moderate to good yields. This strategy gives an efficient and convenient solution for the synthesis of α-pyrazole and α,α-dipyrazole ketonederivatives. The control experiment demonstrates that in
The synthesis of N-1 substituted 4-bromo-, 3,4-dibromo- and 3,4,5-tribromopyrazoles starting from the NH-pyrazoles is described. C-13 Nmr spectroscopic studies with the title compounds are presented, investigating the influence of substituents on C-13-chemical shifts and C-13, H-1 spin coupling constants.
Visible-light-induced controllable α-chlorination of nafimidone derivatives through LMCT excitation of CuCl2