The first asymmetric synthesis of 3-methyleneindolines from alkynyl imines has been developed via a rhodium-catalyzed tandem process: regioselective alkynylation of the internal alkynes and subsequent intramolecular addition to the imines. The reaction proceeded with unconventional chemoselectivity and provided 3-methyleneindolines with good yields (up to 82% yield) and high enantioselectivities (up
第一个由炔基
亚胺不对称合成 3-亚甲基二氢
吲哚是通过
铑催化串联过程开发的:内部
炔烃的区域选择性炔基化和随后的
亚胺分子内加成。该反应以非常规的
化学选择性进行,并提供了具有良好产率(高达 82% 的产率)和高对映选择性(高达 97% ee)的 3-亚甲基二氢
吲哚。此外,这种转变还具有反应条件温和、原子经济性好、底物范围广等特点。