作者:Jaka Glavač、Georg Dahmann、Franc Požgan、Sebastijan Ričko、Bogdan Štefane、Jurij Svete、Uroš Grošelj
DOI:10.17344/acsi.2017.3438
日期:2017.12.15
Synthetic approaches towards novel 3-pyrazolidinone derivatives functionalized at positions N(1) and/or C(5) were studied. 5-Aminoalkyl-3-pyrazolidinones were prepared in four steps from N-protected glycines via Masamune-Claisen homologation, reduction, O-mesylation, and cyclisation with a hydrazine derivative. The free amines were prepared by acidolytic deprotection. Title compound was also prepared
研究了在位置N(1)和/或C(5)上官能化的新型3-吡唑烷酮衍生物的合成方法。由N-保护的甘氨酸通过Masamune-Claisen同源化,还原,O-甲磺酰化和与肼衍生物的环化反应,在四个步骤中制备5-氨基烷基-3-吡唑烷酮。通过酸解脱保护制备游离胺。还通过用水合肼对N-Boc-吡咯啉-2(5H)-1进行“环切换”转化来制备标题化合物。对5-(N-烷基-N-Cbz-氨基甲基)吡唑烷-3-酮进行氢解脱保护,然后与1,1'-羰基二咪唑(CDI)环合,得到两个新的全氢咪唑并[1,5-b]吡唑代表,是几乎未开发的杂环系统。3-氧代吡唑烷-5-羧酸的酰胺化以中等收率得到相应的羧酰胺。由(S)-AlaOMe和(S)-ProOMe获得的非对映体非外消旋羧酰胺通过MPLC分离。