Palladium catalysed reactions of allene with active methylene pronucleophiles. C-1,3-Dienylmethyl derivatives and their Diels–Alder reactions
摘要:
A 2-step 100% atom economic sequence is reported whereby active methylene pronucleophiles react with 2 mol equiv. of allene to give bis-1,3-dienylmethyl derivatives of the pronucleophiles. Subsequent double Diels-Alder reactions furnish 1,1'-linked cyclohexenes with a 3-carbon spacer. (C) 2001 Published by Elsevier Science Ltd.
Conjugated Diene-Assisted Allylic C−H Bond Activation: Cationic Rh(I)-Catalyzed Syntheses of Polysubstituted Tetrahydropyrroles, Tetrahydrofurans, and Cyclopentanes from Ene-2-Dienes
作者:Qian Li、Zhi-Xiang Yu
DOI:10.1021/ja100409b
日期:2010.4.7
activation of allylic C-H bonds and their subsequent insertion into the alkene moieties of conjugateddienes. This novel C-H activation/alkene insertionreaction provides an efficient way to synthesize polysubstituted tetrahydropyrroles, tetrahydrofurans, and cyclopentanes with quaternary carbon centers. Preliminary mechanistic studies using D-labeling experiments have revealed that allylic C-H activation
A 2-step 100% atom economic sequence is reported whereby active methylene pronucleophiles react with 2 mol equiv. of allene to give bis-1,3-dienylmethyl derivatives of the pronucleophiles. Subsequent double Diels-Alder reactions furnish 1,1'-linked cyclohexenes with a 3-carbon spacer. (C) 2001 Published by Elsevier Science Ltd.