An enantioselective formal thio[3 + 3] spiroannulation reaction of indoline-2-thiones to 1-azadienes has been developed by the use of a quinine-derived bifunctional tertiary amine-thiourea catalyst, which furnished a series of optically active spiro[thiopyranoindole-benzoisothiazole] heterocycles with a spiro quaternary C–N/C–S stereogenic centers in high yields with good to excellent diastereo- and
通过使用
奎宁衍生的双官能叔胺-
硫脲催化剂开发了
吲哚啉-2-
硫酮与1-氮杂二烯的对映体选择性
硫[3 + 3]螺环化反应,该催化剂提供了一系列旋光性螺[thiopyranoindole-具有螺环季
铵化C–N / C–S立体异构中心的苯并
异噻唑]
杂环化合物,其高收率具有出色的非对映选择性和对映选择性。