Stereoselective Synthesis of 1-Substituted Homotropanones, including Natural Alkaloid (−)-Adaline
作者:Sandra Hernández-Ibáñez、Ana Sirvent、Miguel Yus、Francisco Foubelo
DOI:10.3390/molecules28052414
日期:——
using chiral N-tert-butanesulfinyl imines as reaction intermediates, is described. The reaction of organolithium and Grignard reagents with hydroxy Weinreb amides, chemoselective N-tert-butanesulfinyl aldimine formation from keto aldehydes, decarboxylative Mannich reaction with β-keto acids of these aldimines, and organocatalyzed L-proline intramolecular Mannich cyclization are key steps of this methodology
描述了使用手性 N-叔丁亚磺酰亚胺作为反应中间体的 1-取代同托烷酮的立体控制合成。有机锂和格氏试剂与羟基 Weinreb 酰胺的反应、从酮醛形成化学选择性 N-叔丁亚磺酰基醛亚胺、与这些醛亚胺的 β-酮酸的脱羧曼尼希反应,以及有机催化的 L-脯氨酸分子内曼尼希环化是该方法的关键步骤. 通过合成天然产物 (-)-adaline 及其对映异构体 (+)-adaline,证明了该方法的实用性。