作者:Olivier Mahé、Isabelle Dez、Vincent Levacher、Jean-François Brière
DOI:10.1039/c2ob25227a
日期:——
The straightforward asymmetric construction of bio-relevant Δ2-pyrazolines having either N-(thio)amide or N-acetyl functional groups and flanked by aryl substituents such as phenol at C3 and C5 has been achieved through an enantioselective phase transfer organocatalytic addition of N-Boc hydrazine to chalcones followed by a transprotection sequence allowing N-Boc transformation into N-CXNHR (X = S, O) or N-Ac functional groups. This approach was applied to a straightforward elaboration of chiral monoamine oxidase inhibitor derivatives.
通过将 N-Boc 肼与查耳酮进行对映选择性相转移有机催化加成,然后进行转保护程序,使 N-Boc 转化为 N-CXNHR(X = S、O)或 N-Ac官能团,从而直接不对称地构建出具有 N-(硫)酰胺或 N-乙酰基官能团并在 C3 和 C5 处具有芳基取代基(如苯酚)的生物相关 Δ2 吡唑啉。这种方法被用于直接制备手性单胺氧化酶抑制剂衍生物。