Concise, stereodivergent and highly stereoselective synthesis of <i>cis-</i> and <i>trans</i>-2-substituted 3-hydroxypiperidines – development of a phosphite-driven cyclodehydration
作者:Peter H Huy、Julia C Westphal、Ari M P Koskinen
DOI:10.3762/bjoc.10.35
日期:——
A concise (5 to 6 steps), stereodivergent, highly diastereoselective (dr up to >19:1 for both stereoisomers) and scalable synthesis (up to 14 g) of cis- and trans-2-substituted 3-piperidinols, a core motif in numerous bioactive compounds, is presented. This sequence allowed an efficient synthesis of the NK-1 inhibitor L-733,060 in 8 steps. Additionally, a cyclodehydration-realizing simple triethylphosphite
一个简洁(5 到 6 个步骤)、立体发散、高度非对映选择性(两种立体异构体的 dr 高达 >19:1)和可扩展的合成(高达 14 g)顺式和反式 2-取代 3-哌啶醇,一个核心基序在众多生物活性化合物中,介绍了。该序列允许分 8 个步骤有效合成 NK-1 抑制剂 L-733,060。此外,还开发了一种可实现环脱水的简单亚磷酸三乙酯,作为三苯基膦的替代品。在这里,化学计量氧化的 P(V)-副产物(磷酸三乙酯)在后处理过程中很容易通过皂化去除,克服了通常与氧化三苯膦相关的分离困难。