- Diastereoselective synthesis of 1,3-disubstituted isoindolines and sultams via bronsted acid catalysis
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The bis(trifluoromethane)sulfonimide (Tf2NH) catalyzed intramolecular hydroamidation of terminal alkynes is reported. The combination of Et3SiH and Tf2NH provides cis-1,3-disubstituted isoindolines and sultams in high yield (up to 98%) and high diastereoselectivity (up to 99?:?1 d.r.).
- Tao, Ye,Gilbertson, Scott R.
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supporting information
p. 11292 - 11295
(2018/10/26)
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- Palladium-catalysed direct heteroarylation of bromobenzenes bearing SO 2R substituents at C2 or C4
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Palladium-catalysed direct arylation of 4- or 2-bromobenzenesulfonic acid derivatives in the presence of a variety of heteroaromatics was found to proceed using 0.1-0.5 mol% palladium acetate as the catalyst. However, both the nature and position of the SO2R substituent on such bromobenzenes has an influence on the reaction rates and yields. The presence of SO2Et or SO2NEt2 at the C2 or C4 position of bromobenzene is tolerated. Good results were also obtained from bromobenzene substituted at C4 by SO2NHPh or SO2OPh. On the other hand, the reactions of bromobenzenes bearing either SO2N(Me)CH2Ph or SO 2OAr at C2 led in some cases to intramolecular reactions instead of the desired intermolecular couplings. Some reactions were performed in cyclopentyl methyl ether, which can be considered as a green solvent.
- Bheeter, Charles Beromeo,Jin, Rongwei,Bera, Jitendra K.,Doucet, Henri
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p. 5987 - 5996
(2013/05/09)
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- Palladium-catalyzed C-C coupling of aryl halides with isocyanides: An alternative method for the stereoselective synthesis of (3E)-(Imino)isoindolin- 1-ones and (3E)-(imino)thiaisoindoline 1,1-dioxides
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A palladium-catalyzed, one-pot cyclization reaction to construct (3E)-(imino)isoindolin-1-ones and (3E)-(imino)thiaisoindoline 1,1-dioxides by introducing ortho-reactive functional groups on aryl halides is reported. Under optimal conditions, the cyclization reaction afforded the corresponding products in good to excellent yields (up to 93%) with high stereoselectivity. Notably, this transformation successfully extends its application for the synthesis of phenanthridines and dibenzooxazepines. This new synthetic protocol not only extends the application platform for palladium-catalyzed C-C coupling of aryl halides with isocyanides, but also opens atom-economic and step-economic synthetic routes for nitrogen-containing heterocyclic compounds with wide functional group compatibility. Copyright
- Liu, Bifu,Li, Yibiao,Jiang, Huanfeng,Yin, Meizhou,Huang, Huawen
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p. 2288 - 2300
(2012/11/07)
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