Synthesis of Pyrroles through Coupling of Enyne-hydrazones with Fischer Carbene Complexes
摘要:
The coupling of enyne-imines with Fischer carbene complexes leads to the formation of alkenylpyrrole derivatives. Maximum yields of pyrrole adducts were obtained using N,N-dimethylhydrazones. A mechanism involving alkyne insertion followed by nucleophilic attack of the imine nitrogen at the intermediate alkenylcarbene complex was proposed.
The Vinyl Moiety as a Handle for Regiocontrol in the Preparation of Unsymmetrical 2,3-Aliphatic-Substituted Indoles and Pyrroles
作者:Malcolm P. Huestis、Lina Chan、David R. Stuart、Keith Fagnou
DOI:10.1002/anie.201006381
日期:2011.2.7
enynes with N‐aryl ureas (X=NR2) and N‐vinylacetamides (X=C(O)Me), affording the corresponding 2‐alkenylindoles and 2‐alkenylpyrroles in good yield. Simple hydrogenation delivers the C2/C3‐aliphatic‐substituted indole or pyrrole (see scheme).
Rho-Rho-Rho您的小船:铑催化剂可实现烯炔与N-芳基脲(X = NR 2)和N-乙烯基乙酰胺(X = C(O)Me)的区域选择性氧化偶联,提供相应的2-烯基吲哚和2-烯基吡咯的收率好。简单的氢化作用即可得到C2 / C3脂肪族取代的吲哚或吡咯(参见方案)。
Claisen Rearrangement Using
Bicyclic 2-[(<i>Z</i>)-Alkenyl]dihydropyran: Stereoselective
Synthesis of <i>trans</i>-Substituted Spiro[4.5]decane
作者:Susumu Kobayashi、Atsuo Nakazaki
DOI:10.1055/s-0029-1217339
日期:——
We report the first example of the Claisen rearrangement in the 2-[(Z)-alkenyl]dihydropyran system yielding spiro[4.5]decane in a trans fashion. This protocol is useful for the synthesis of trans-substituted spiro[4.5]decanes, a potentially useful class of spirocyclic terpenes and alkaloids.
The Pd(II)-catalyzed one-pot tandem cyclization/alkylation reactions of enynoates with allylic alcohols have been demonstrated. In this reaction, an innovative protocol proceeded well through Pd-catalyzed intramolecular selective 6-endo cyclization, insertion of allylic alcohols into the Pd–C bond of vinylpalladium species generated in situ, and β-hydrogen elimination processes. This conversion provides
A Pd(II)-catalyzed mild and highly regioselective 6-endo cyclization/allylation reaction of enynoates with simple allylic alcohols has been developed. Under mild reaction conditions, the vinyl palladium species generated in situ after cyclization could insert C–C double bond of allylic alcohol through cross-coupling reaction and lead to the formation of allyl pyrone via β-OH elimination. This cascade
In Situ Generation of Alkynylzinc and Its Subsequent Negishi Reaction in a Flow Reactor
作者:Mohanraj Kandasamy、Yu- Hsuan Huang、Balaji Ganesan、Gopal Chandru Senadi、Wei-Yu Lin
DOI:10.1002/ejoc.201900471
日期:2019.7.23
and highly efficient method for the synthesis of internal alkynes or 1,3‐enynes was achieved in a continuous flow system through the generation of an alkynylzinc reagent from lithium acetylide and zinc bromide followed by a Pd‐catalyzed cross‐coupling with aryl or vinyl iodides.