Reactions of α-aminoester imines with nitrosobenzene
作者:Rodríguez C. Hernán、Márquez V. Amelia、Claudio A. Chuaqui
DOI:10.1016/s0040-4039(01)80429-9
日期:1989.1
Arylidene imines of α-aminoesters react with nitrosobenzene at room temperature yielding a diarylnitrone and a Z-diimine.Adecuate mechanistic scheme is postulated to account for the products formed.
Rhodium-Catalyzed CH Annulation of Nitrones with Alkynes: A Regiospecific Route to Unsymmetrical 2,3-Diaryl-Substituted Indoles
作者:Hao Yan、Haolong Wang、Xincheng Li、Xiaoyi Xin、Chunxiang Wang、Boshun Wan
DOI:10.1002/anie.201503997
日期:2015.9.1
of anilines or related compounds with internal alkynes provides straightforward access to 2,3‐disubstituted indole products. However, this transformation proceeds with poor regioselectivity in the synthesis of unsymmetrically 2,3‐diaryl substituted indoles. Herein, we report the rhodium(III)‐catalyzed CH annulation of nitrones with symmetrical diaryl alkynes as an alternative method to prepare 2,
Multicomponent Synthesis of Pyrroles from Cyclopropanes: A One-Pot Palladium(0)-Catalyzed Dehydrocarbonylation/Dehydration
作者:William J. Humenny、Polydoros Kyriacou、Katarina Sapeta、Avedis Karadeolian、Michael A. Kerr
DOI:10.1002/anie.201206177
日期:2012.10.29
es yields tetrahydro‐1,2‐oxazines, which in turn undergo a Tsuji dehydrocarbonylation to give dihydro‐1,2‐oxazines (see scheme; dba=dibenzylideneacetone). Addition of base to this reaction mixture results in clean conversion to pyrroles. The result is a flexible three‐component strategy for the synthesis of tetrasubstituted pyrroles.
A series of novel enantiomerically pure spiro-isoxazolidines and spiro-isoxazolines were synthesized regioselectively by 1,3-dipolarcycloadditionusing respectively two dipoles, nitrones and nitrileoxides, on the exocyclic double bond of the B ring of tomentosin (α-methylene-γ-butyrolactone), a sesquiterpene lactone extracted from Dittrichia viscosa.
Reactions of Aldonitrones with Phenylphosphonothioic Dichloride and Related Compounds. Formation of 2-Arylbenzothiazoles from α,<i>N</i>-Diarylnitrones
Reactions of α-aryl-N-methylnitrones with phenylphosphonothioic dichloride (1), diphenylphosphinothioic chloride (6), or thiophosphoryl trichloride (7) gave N-methylbenzamide and N-methylthiobenzamide derivatives, and the latter became major in the presence of tertiary amine. α,N-Diarylnitrones (4) reacted with 1 to give 2-arylbenzothiazoles (5) at room temperature in moderate yields. Reaction of 4