Aggregative activation and heterocyclic chemistry I complex bases promoted arynic cyclisation of imines or enaminoketones; regiochemical synthesis of indoles
摘要:
The complex base NaNH2-t-BuONa allowed expeditious syntheses of indoles by arynic cyclisation of imines or enaminoketones prepared from halogeno anilines and carbonyl derivatives. Unstable imines may be used without purification, complex bases being unsensitive to impurities. It is showed that this kind of reaction may be applied to mixture of substrates suitably halogenated on the benzene ring. Formation of three components aggregates is proposed to explain a number of observations.
Enantioselective reaction of N-methyl-N-phenyl-3-amino-2-cyclohexen-1-one derivatives to the corresponding N-methylhexahydro-4-carbazolones has been accomplished by photolysis in a water suspension of 1:1 inclusion compounds of the starting material with opticallyactivehost compounds derived from tartaric acid. 3-(N-Methylanilino)-2,5,5-trimethyl-2-cyclohexen-1-one formed two kinds of dimorphous
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
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
Rh(III)-Catalyzed C–H Annulation of <i>N</i>-Nitrosoanilines with Iodonium Ylides for the Synthesis of <i>N</i>-Alkyl Indoles
作者:Chaoshui Liu、Qiuzi Dai、Yaqian Li、Chuhan Huang、Lijuan Guo、Zi Yang
DOI:10.1021/acs.joc.3c00517
日期:2023.6.2
A novel protocol for synthesizing N-alkyl indoles from readily available N-nitrosoanilines and iodonium ylides through the rhodium(III)-catalyzed C–H bond activation/intramolecular cyclization reaction has been described. This strategy employs nitroso as a traceless directing group. The transformation features powerful reactivity, tolerates various functional groups, and proceeds with moderate yields
Aggregative activation and heterocyclic chemistry I complex bases promoted arynic cyclisation of imines or enaminoketones; regiochemical synthesis of indoles
The complex base NaNH2-t-BuONa allowed expeditious syntheses of indoles by arynic cyclisation of imines or enaminoketones prepared from halogeno anilines and carbonyl derivatives. Unstable imines may be used without purification, complex bases being unsensitive to impurities. It is showed that this kind of reaction may be applied to mixture of substrates suitably halogenated on the benzene ring. Formation of three components aggregates is proposed to explain a number of observations.