Regioselective lipase catalyzed synthesis of diester crowns. New asymmetric macrocycles containing a 1,3-bis(1H-pyrazol-1-yl)propane unit
作者： Santiago Conde , Marta Fierros , Isabel Dorronsoro , María Luisa Jimeno , María Isabel Rodríguez-Franco
DOI: 10.1016/S0040-4020(97)00727-8
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摘要: Abstract Regioselective lipase catalyzed intramolecular transesterification of dipyrazolic tetraester 1 with di-, tri- and tetraethyleneglycol afforded symmetric and, in smaller amounts, asymmetric diester crowns including a 1,3-bis(1 H -pyrazol-1-yl)propane unit. Their structures have been unequivocally elucidated after their 13 C NMR spectra INEPT experiments.
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