Access to Isocarbacyclin Derivatives via Substrate-Controlled Enolate Formation: Total Synthesis of 15-Deoxy-16-(<i>m</i>-tolyl)- 17,18,19,20-tetranorisocarbacyclin
作者:Neil A. Sheddan、Johann Mulzer
DOI:10.1021/ol0515762
日期:2005.11.1
[reaction: see text] We describe a convergent and flexible synthesis of 15-deoxy-16-(m-tolyl)-17,18,19,20-tetranorisocarbacyclin (15-deoxy-TIC), a simple isocarbacyclin derivative. The synthesis takes advantage of two key step reactions: a regioselective deprotonation of the described ketone under substrate control which is then trapped, as the enol triflate, to generate the C6-C9alpha endocyclic double
[反应:见正文]我们描述了15-脱氧-16-(间甲苯基)-17,18,19,20-四正异卡巴环素(15-脱氧-TIC)的聚合反应和灵活合成方法,这是一种简单的异卡巴环素衍生物。该合成利用了两个关键步骤反应的优势:在底物控制下,将所述酮进行区域选择性去质子化,然后将其作为烯丙基三氟甲磺酸酯被捕集,以生成C6-C9alpha环内双键,然后由sp2-sp3 Pd催化的交叉键合适的伯烷基格氏试剂进行-C-C6偶联反应。ω-侧链中C13-C14(E)-双键的引入是通过Julia-Kocienski烯烃进行的。