With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.21169-71-1,Isoxazole-5-carboxylic acid,as a common compound, the synthetic route is as follows.,21169-71-1
General procedure: Compounds were synthesized in solution phase using Boc-protected amino acids on 100-200mg scale. Firstly, the amino acid (1.2-1.5equiv) was activated with HBTU (1.5equiv) and DIPEA (1.5equiv) as 0.2-0.5M solution in DMF for 10min. Then the solution was added to an amino group bearing C-terminal moiety (R1R2NH) and the mixture was stirred for a minimum of 1h at room temperature. The reaction mixture was diluted with EtOAc and washed with saturated NaHCO3 (2¡Á). The organic extracts were dried over MgSO4, filtered and evaporated in vacuo. The crude product was then treated with 20% TFA in DCM and stirred for 1-2h to remove the Boc group. TFA was removed by evaporating the reaction mixture under a stream of N2. The residue was dissolved in DCM and washed with saturated NaHCO3 (2¡Á). DCM phase was dried with MgSO4, filtered and evaporated in vacuo. Subsequent N-Boc-amino acids and amines were sequentially coupled under the same conditions. Each coupling reaction was monitored by ESMS, with most reactions going to completion overnight. All final compounds were purified on rpHPLC (97% by analytical HPLC) and fully characterized by NMR and HRMS (yields between 30% and 40%).
As the paragraph descriping shows that 21169-71-1 is playing an increasingly important role.
Reference£º
Article; Yau, Mei-Kwan; Liu, Ligong; Lim, Junxian; Lohman, Rink-Jan; Cotterell, Adam J.; Suen, Jacky Y.; Vesey, David A.; Reid, Robert C.; Fairlie, David P.; Bioorganic and Medicinal Chemistry Letters; vol. 26; 3; (2016); p. 986 – 991;,
Isoxazole – Wikipedia
Isoxazole | C3H3NO – PubChem