结果表明,用五硫化二磷或Lawesson试剂处理α-氨基酸衍生的二酰胺可为制备5-氨基噻唑提供便利的方法。通过该方法,除了单环5-氨基噻唑19,新的双环5-氨基噻唑衍生物,如4,5,6,7-四氢噻唑并[5,4- b〕吡啶11,5,6,7,8-四氢-4- ħ -噻唑并[5,4- b ]吖庚因7,-4,5,6,7,8,9- hexahydrothiazolo并[5,4- b ]吖辛因16在中等制备到从简单的良好的产率和相关的化合物双酰胺,表明该方法具有广泛的通用性。
Brønsted acid catalyzed azlactone ring opening by nucleophiles
作者:Adriane A. Pereira、Pedro P. de Castro、Amanda C. de Mello、Bruno R.V. Ferreira、Marcos N. Eberlin、Giovanni W. Amarante
DOI:10.1016/j.tet.2013.11.037
日期:2014.5
Brønsted acid catalyzed azlactone ringopening in the presence of different nucleophiles leading to the efficientsynthesis of protected amides and amino esters is presented. Sixteen compounds were synthesized in good to excellent isolated yields. Mechanism investigation by using ESI(+)-MS/MS revealed that the CSA catalyst promotes azlactone activation for electrophilic attack facilitating therefore
A Study of the Strength of a Template Molecule—A Functional Monomer Interaction That Affects the Performance of Molecularly Imprinted Polymers and Its Application to Chiral Amplification
molecularly imprinted polymer (MIP), N-benzoyl-(S)-valine anilide-imprinted polymer (IP-2), was prepared using hydrogen-bonding interactions as a main force in the pre-polymerization step. The performance of the IP-2 was evaluated via batch procedure and compared with a (S)-valine anilide-imprinted polymer (IP-1) that was prepared using an ionic interaction that is stronger than hydrogenbonding. Although both