1034356-04-1Relevant articles and documents
Selective β-hydroxyethylation at the N-1 position of a pyrazolone: Synthesis of benzyl 1-(β-hydroxyethyl)-5-methyl-3-oxo-2-phenyl-2,3-dihydro- 1H-pyrazole-4-carboxylate
Siegmund, Aaron,Retz, Daniel,Xi, Ning,Dominguez, Celia,Bürli, Roland,Liu, Longbin
, p. 1005 - 1008 (2008)
Selective 2-hydroxyethylation at the N-1 position of benzyl 5-methyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxylate with epoxides was achieved using either AlMe3 or Mg(ClO4)2 under mild conditions. The epoxide ring opening was both regioselective and stereospecific. Moderate to excellent yields were obtained from mono- and disubstituted epoxides with the exception of cis-dimethyl-2-butene oxide that gave only a trace amount of the product. Georg Thieme Verlag Stuttgart.