Green protection of pyrazole, thermal isomerization and deprotection of tetrahydropyranylpyrazoles, and high-yield, one-pot synthesis of 3(5)-alkylpyrazoles
作者:Basil M. Ahmed、Gellert Mezei
DOI:10.1039/c5ra00837a
日期:——
6-bis(pyrazol-3(5)-yl)hexane. The value of the new approach lies in the discovery of a green (solvent- and catalyst-free, quantitative) protection of pyrazole, followed by a high-yield lithiation/alkylation/deprotection sequence in the same pot. For the first time, the corresponding N-tetrahydropyran-2-yl (THP) intermediates have been isolated and characterized. Thermalisomerization of the 5-alkyl-1-(THP)