This new method demonstrates effective asymmetric synthesis generating high enantioselectivities in spiro compounds, suggesting major advancements in cycloaddition chemistry.
Key Points
Enantioenriched indole-fused spiro compounds were achieved with excellent yields (60%–89%), illustrating the effectiveness of this approach.
The cycloaddition reaction exhibited outstanding diastereoselectivities (up to >19:1 dr) and enantioselectivities (83%–99% ee), highlighting its precision.
This methodology employed chiral phosphoric acid catalysis to facilitate the first catalytic asymmetric [4+2] cycloaddition of 3-methyl-2-indolylmethanols.
The study challenges traditional indolylmethanol chemistry by identifying 3-methyl-2-indolylmethanols as C4 synthons, indicating a shift in reactivity.