Synthesis of the Azepinoindole Framework via Oxidative Heck (Fujiwara-Moritani) Cyclization
作者:Erik Van der Eycken、Pavel Donets
DOI:10.1055/s-0030-1260057
日期:2011.7
A catalytic oxidative Heck (Fujiwara-Moritani) cyclization has been evaluated for construction of the azepinoindole framework starting from readily available 3-indoleacetic acid amides. The supporting role of the amide group in the substrate has been demonstrated necessary for the success of the cyclization.
One-Pot Three-Component Synthesis of Vicinal Diamines via In Situ Aminal Formation and Carboamination
作者:Ugo Orcel、Jerome Waser
DOI:10.1002/anie.201607318
日期:2016.10.4
A synthesis of vicinal diamines via in situ aminalformation and carboamination of allyl amines is reported. Employing highly electron‐poor trifluoromethyl aldimines in their stable hemiaminal form was key to enable both a fast and complete aminalformation as well as the palladium‐catalyzed carboamination step. The conditions developed allow the introduction of a wide variety of alkynyl, vinyl, aryl
and diastereoselective functionalization of the secondary over the tertiary α-C–H bond of 2-substituted pyrrolidines is first realized. Subsequent intermolecular addition of a nucleophile to the generated N,O-acetal and cleavage of the aromatic substituent leads to 2,5-disubstitutedpyrrolidines.
Compounds are disclosed of formula (I)
wherein
Ra, Rb, Rc and Rd represent hydrogen atoms or Ra and Rc together form a bond and Rb and Rd together form -CH=CH-CH=CH-; -N represents a 5-membered (optionally containing an oxygen atom adjacent to the nitrogen) or a 6-membered ring, which ring optionally contains one unit of unsaturation and which is unsubstituted or substituted by hydroxy, hydroxymethyl, oxo, optionally substituted methylidene, -COR1 (where R1 is C1-6 alkyl, -OR2 or -NHR2, and R2 is hydrogen, C1-6 alkyl, aryl or ar(Ci-6)alkyl) or =NOR3 (where R3 is G1-6 alkyl);
X represents a direct bond, -CH2- or -CH20-;
Ar represents a substituted phenyl moiety (provided that when -N does not contain an oxygen atom and is unsubstituted, Ar contains more than one unsaturated ring); and physiologically acceptable salts and solvates thereof.
The compounds are indicated as useful for the treatment of pain and cerebral ischaemia.
Processes and intermediates for their preparation and pharmaceutical compositions containing them are also disclosed.
作者:Igor D. Jurberg、Bo Peng、Eckhard Wöstefeld、Maximilian Wasserloos、Nuno Maulide
DOI:10.1002/anie.201108639
日期:2012.2.20
Sacrifice for the team: A one‐pot method achieves remote functionalization at the α‐position of an amine moiety through the sacrificial reduction of a neighboring group. The process takes advantage of an intramolecular redox reaction, thereby avoiding the need for any external oxidants. This method was applied to a concise five‐step total synthesis of indolizidine 167B.