Synthesis and Characterization of Novel Methyl (3)5-(N-Boc-piperidinyl)-1H-pyrazole-4-carboxylates
作者:Gita Matulevičiūtė、Eglė Arbačiauskienė、Neringa Kleizienė、Vilija Kederienė、Greta Ragaitė、Miglė Dagilienė、Aurimas Bieliauskas、Vaida Milišiūnaitė、Frank A. Sløk、Algirdas Šačkus
DOI:10.3390/molecules26133808
日期:——
Series of methyl 3- and 5-(N-Boc-piperidinyl)-1H-pyrazole-4-carboxylates were developed and regioselectively synthesized as novel heterocyclic amino acids in their N-Boc protected ester form for achiral and chiral building blocks. In the first stage of the synthesis, piperidine-4-carboxylic and (R)- and (S)-piperidine-3-carboxylic acids were converted to the corresponding β-keto esters, which were
开发了一系列 3- 和 5-( N -Boc-哌啶基)-1 H-吡唑-4-羧酸甲酯,并将其作为新型杂环氨基酸以N- Boc 保护的酯形式合成,用于非手性和手性结构单元。在合成的第一阶段,哌啶-4-羧酸和(R)-和(S)-哌啶-3-羧酸转化为相应的β-酮酯,然后用N , N-二甲基甲酰胺二甲基甲酰胺处理。缩醛。随后β-烯胺二酮与各种N-单取代肼反应得到目标5-( N - Boc-哌啶基)-1 H以-吡唑-4-羧酸盐为主要产物,由水合肼制备的互变异构的NH-吡唑进一步用卤代烷进行N-烷基化,得到3-( N -Boc-哌啶基) -1H-吡唑-4-羧酸盐。新型杂环化合物的结构已通过1 H-、13 C- 和15 N-NMR 光谱和 HRMS 研究证实。