Expanding the Scope of Mn(OAc)3-Mediated Cyclizations: Synthesis of the Tetracyclic Core of Tronocarpine
摘要:
Pyrroles, indoles, and surprisingly, indolines, when equipped with a pendant malonyl group on the nitrogen atom, were effective substrates in a Mn(III)-mediated oxidative cyclization reaction, yielding the 1,2-annulated products in good to excellent yields. When indole acetonitrile was used as a substrate this method provided a rapid synthesis of a tetracyclic tronocarpine subunit.
Expanding the Scope of Mn(OAc)3-Mediated Cyclizations: Synthesis of the Tetracyclic Core of Tronocarpine
摘要:
Pyrroles, indoles, and surprisingly, indolines, when equipped with a pendant malonyl group on the nitrogen atom, were effective substrates in a Mn(III)-mediated oxidative cyclization reaction, yielding the 1,2-annulated products in good to excellent yields. When indole acetonitrile was used as a substrate this method provided a rapid synthesis of a tetracyclic tronocarpine subunit.
An Aluminum Triflate-Catalyzed Intramolecular Reaction Sequence Toward Concise Construction of the Tetrahydropyrido[1,2-<i>a</i>]indol-6-one Skeleton
作者:Jun-Jiao Wang、An-Xi Zhou、Gang-Wei Wang、Shang-Dong Yang
DOI:10.1002/adsc.201400391
日期:2014.11.3
AbstractAn aluminum triflate‐catalyzed intramolecular reaction sequence involving protonation and Mannich‐like nucleophilic addition of indoles toward the concise construction of the tetrahydropyrido[1,2‐a]indol‐6‐one skeleton is reported. This new reaction pattern employs a carbon atom as nucleophile to form a CC bond which bears one or even two quaternary carbons and leads to the dearomatization of indoles with high atom economy.magnified image