Enantioselective Phase-Transfer-Catalyzed Synthesis of Spirocyclic Azetidine Oxindoles
作者:Alexander J. Boddy、Aditya K. Sahay、Emma L. Rivers、Andrew J. P. White、Alan C. Spivey、James A. Bull
DOI:10.1021/acs.orglett.4c00358
日期:2024.3.15
Spiro-3,2′-azetidine oxindoles combine two independently important pharmacophores in an understudied spirocyclic motif that is attractive for medicinal chemistry. Here, the enantioselective synthesis of these structures is achieved in up to 2:98 er through intramolecular C–C bond formation, involving activation of the substrate with a novel SF5-containing chiral cation phase-transfer (PT) catalyst
Spiro-3,2'-azetidine oxindoles 将两个独立重要的药效团结合在一个正在研究的螺环基序中,这对药物化学很有吸引力。在这里,这些结构的对映选择性合成是通过分子内 C-C 键形成在高达 2:98 er 的时间内实现的,涉及用新型含 SF 5的手性阳离子相转移 (PT) 催化剂活化底物。该产品易于精制/脱保护,以提供医学相关的对映体富集化合物。对照实验表明界面 PT 机制,通过活化氯离子离去基团实现催化不对称诱导。