A novel and efficient Rh(III)-catalyzed direct C–H bond tandem annulation of N-nitrosoanilines with 1,3-dicarbonylcompounds through two C–H bond cleavage was developed. This protocol provides a rapid access to a series of valuable tetrahydrocarbazol-4-ones with the feature of readily available starting materials, broad functional group tolerance, and in situ generation of carbene precursors. Importantly
A series of carbazolone derivatives and 3-acetylindoles have been achieved via PIFA-mediated intramolecular cyclization of 2-aryl enaminones. This process allows the N-moiety on the side-chain to be annulated to the benzene ring via the metal-free oxidative aromatic CâN bond formation.
Rapid access to polysubstituted tetrahydrocarbazol‐4‐ones via sequential selective C−H functionalization from
<i>N</i>
‐nitrosoanilines
作者:Chan Li、Yanchen Yang、Feifei Fang、Chaoyi Liu、Chunpu Li、Dechuan Wang、Hong Liu
DOI:10.1002/cjoc.202300015
日期:——
have developed a strategy of Rh(III)-catalyzed C—H activation of N-nitrosoanilines and iodonium ylides to construct novel tetralydrocarbzol-4-one scaffolds, which provided valuable templates for sequentialC—Hfunctionalization such as alkylation, alkenylation, amidation and (hetero)arylation at C5-position of tetralydrocarbzol-4-one with different coupling partners. Gram-scale synthesis and further transformations