期刊
ORGANIC LETTERS
卷 22, 期 9, 页码 3618-3622出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.0c01065
关键词
-
资金
- Deutsche Forschungsgemeinschaft (Reinhart Koselleck program) [GRK 1626]
- Alexander von Humboldt foundation
The title compounds undergo intramolecular [2 + 2] photocycloaddition reactions when irradiated with visible light in the presence of a chiral sensitizer. Up to four defined stereogenic centers are formed in a single step (14 examples with a tethered alkene, 6 examples with an allene, 72-99% yield, 81-99% ee) at catalyst loadings as low as 0.5 mol %. The alkyl group in the 3-position is crucial for the success of the reaction as it leads to a significant decrease of the triplet energy.
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