Organocatalytic Asymmetric Sulfa-Michael Addition of 2-Aminothiophenols to Chalcones: First Enantioselective Access to 2,3,4,5-Tetrahydro-1,5-benzothiazepines
作者:Vasco Corti、Patricia Camarero Gonzalez、Julie Febvay、Lorenzo Caruana、Andrea Mazzanti、Mariafrancesca Fochi、Luca Bernardi
DOI:10.1002/ejoc.201601364
日期:2017.1.3
asymmetric sulfa-Michael addition of 2-aminothiophenols to trans-chalcones, followed by intramolecular reductive amination. Both reactions have required a careful study to solve several challenging issues. The resulting optimized two-step protocol afforded a range of 2,3,4,5-tetrahydro-1,5-benzothiazepines as single trans-diastereoisomers in moderate to good yields and enantioselectivities.
1,5-苯并噻嗪骨架与药物化学高度相关。据报道,这些支架的催化不对称方法靶向 2,3-dihydro-1,5-benzothiazepin-4-ones,留下相应的胺(2,3,4,5-tetrahydro-1,5-benzo-thiazepines)抵达。在此,我们首次以对映体富集形式介绍这些重要化合物。我们的方法基于 2-氨基苯硫酚与反式查耳酮的催化不对称磺胺-迈克尔加成,然后进行分子内还原胺化。两种反应都需要仔细研究以解决几个具有挑战性的问题。由此产生的优化的两步方案以中等至良好的产率和对映选择性提供了一系列 2,3,4,5-四氢-1,5-苯并硫氮杂作为单一反式非对映异构体。