Studies toward Labeling Cytisine with [<sup>11</sup>C]Phosgene: Rapid Synthesis of a δ-Lactam Involving a New Chemoselective Lithiation−Annulation Method
作者:Jacques Rouden、Thomas Seitz、Laurent Lemoucheux、Marie-Claire Lasne
DOI:10.1021/jo0498157
日期:2004.5.1
receptors, with [11C]phosgene, the rapid synthesis of a lactam model of our target has been studied. The key step of the δ-lactam formation is a new chemoselective lithiation−annulation method, under high dilution, of a suitable piperidinylcarbamoyl chloride. This precursor was obtained from (2-hydroxyethyl)piperidine in a linear synthetic sequence involving a Corey−Fuchs olefination of the corresponding
为了用[ 11 C]光气对强力烟碱受体激动剂半胱氨酸进行放射性标记,已经研究了我们目标的内酰胺模型的快速合成方法。δ-内酰胺形成的关键步骤是一种新的化学选择性锂化-环化方法,该方法是在适当稀释的情况下选择合适的哌啶基氨基甲酰氯。该前体以线性合成顺序从(2-羟乙基)哌啶中获得,该线性合成顺序包括相应醛的Corey-Fuchs烯化,然后使用二酰亚胺当量将碘炔炔选择性还原成(Z)-碘丙烯哌啶。该烯烃用作研究光气作为所需羰基化试剂的几种方法的环化反应的主要前体。