Development of Bifunctional Chiral Thioureas and Thiosquaramides in the Synthesis of Betti Bases
作者:Martyna Malinowska、Anna Zawisza
DOI:10.3390/molecules28237835
日期:——
Bifunctional thioureas and, for the first time, bifunctional thiosquaramides as organocatalysts were used in the asymmetric Betti reaction involving 1-, 2-naphthols and hydroxyquinoline with N-tosylimine and ketimine. The described methodology affords direct access to chiral aminoarylnaphthols in excellent yield (up to 98%) with high enantioselectivity (up to 80% ee) and enantioenriched 3-amino-2-oxindoles
双功能硫脲和双功能硫方酰胺作为有机催化剂首次用于涉及1-、2-萘酚和羟基喹啉与N-甲苯磺酰亚胺和酮亚胺的不对称Betti反应。所述方法能够以优异的产率(高达 98%)和高对映选择性(高达 80% ee)直接获得手性氨基芳基萘酚和对映体富集的 3-氨基-2-羟吲哚(产率高达 78%,高达 98% ee) 。