The development of improved syntheses of PPARγ-sparing, insulin sensitizing thiazolidinedione-ketones
作者:Steven P. Tanis、Jerry R. Colca、Timothy T. Parker、Gerald D. Artman、Scott D. Larsen、Robert C. Gadwood、James R. Zeller
DOI:10.1016/j.tetlet.2019.07.022
日期:2019.8
Ketones 2 (MSDC-0160) and 3 (MSDC-0602) had been selected for clinical development, however their initial syntheses were considered suboptimal for application deep into clinical trials. Difficulties ranging from the nature of the starting material, alcohol oxidation problems, epoxide opening regioisomeric issues, and endgame ketone redox problems had been encountered. Direct ketone introduction/maintenance
已经选择了酮2(MSDC-0160)和酮3(MSDC-0602)进行临床开发,但是它们的初始合成被认为不是最适合用于临床试验。遇到了各种困难,包括原料的性质,醇的氧化问题,环氧化物的打开区域异构问题以及最终的酮氧化还原问题。直接引入酮/维护被期望的最大效率和收敛被发现是关键取决于亲核物种(酸度13,18)和使用前或后alkylative肟基醚/酮肟保护的(见下文)。实现了2(MSDC-0160)和3(MSDC-0602)合成的总产率分别从20%(2)和31%(3)提高到44%(2)和59%(3)。