established that a cyclopentadienyl RhIII complex with two phenyl groups and a pendant amide moiety catalyzes the formal Lossen rearrangement/[3+2] annulation cascade of N‐pivaloyl benzamides and acrylamides with alkynes leading to substituted indoles and pyrroles. Mechanistic studies revealed that this cascade reaction proceeds via not the Lossen rearrangement to form anilides or enamides but C−H bond cleavage
Synthesis of indoles from aroyloxycarbamates with alkynes <i>via</i> decarboxylation/cyclization
作者:Nuannuan Ma、Peihe Li、Zheng Wang、Qipu Dai、Changwen Hu
DOI:10.1039/c8ob00086g
日期:——
decarboxylation/cyclization of aroyloxycarbamates to realize substituted indoles has been disclosed. Terminal alkynes as the coupling partners lead to site specific 2-substitutedindoles through two pathways, while internal alkynes with aroyloxycarbamates can be transformed to 2,3-disubstituted indoles directly. This protocol is further demonstrated by the efficient synthesis of indoles as well as the
Regioselective Arylative Ring-Closing Reaction of 2-Alkynylphenyl Derivatives: Formation of Arylated Benzoxazin-2-ones, Benzoxazin-2-amines and 2,3-Disubstituted Indoles
作者:Hideki Minami、Takuya Kanayama、Reishi Tanaka、Noriko Okamoto、Takuya Sueda、Reiko Yanada
DOI:10.1002/ejoc.201601162
日期:2016.12
2-alkynylphenylureas with diaryliodonium salts gave C,N-double-arylated benzoxazin-2-ones and C-arylated benzoxazin-2-amines, respectively, both bearing fully substituted exocyclic olefins. On the other hand, the palladium-catalysed arylative ring-closing reaction of 2-alkynylphenylcarbamates gave C-arylated 2,3-disubstituted indoles.