Intermediates in the synthesis of dipyrazolic podands and ester crowns via regioselective lipase catalyzed hydrolysis of a tetraester
摘要:
In this work we study the Mitcor miehei lipase-catalyzed hidrolysis of 1,3-bis[3,5-bis(ethoxycarbonyl)-1H-pyrazol-1-yl]prop and the potential usefulness of the resulting acids as intermediates in the synthesis of podand and crown esters. (C) 1997 Elsevier Science Ltd.
Intermediates in the synthesis of dipyrazolic podands and ester crowns via regioselective lipase catalyzed hydrolysis of a tetraester
摘要:
In this work we study the Mitcor miehei lipase-catalyzed hidrolysis of 1,3-bis[3,5-bis(ethoxycarbonyl)-1H-pyrazol-1-yl]prop and the potential usefulness of the resulting acids as intermediates in the synthesis of podand and crown esters. (C) 1997 Elsevier Science Ltd.
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(1H-pyrazol-1-yl)propane unit. Their structures have been unequivocally elucidated after their 1H and 13C NMR spectra and INEPT experiments.
区域选择性脂肪酶催化的二吡唑四酯1与二,三和四乙二醇的分子内酯交换反应提供了对称的,少量的不对称二酯冠,包括1,3-双(1 H-吡唑-1-基)丙烷单元。在其1 H和13 C NMR光谱以及INEPT实验之后,已明确阐明了它们的结构。