A Phosphine-Catalyzed [3 + 2] Annulation Reaction of Modified Allylic Compounds and N-Tosylimines
摘要:
A phosphine-catalyzed annulation of modified allylic ylides with various aromatic imines to form 3-pyrrolines was developed. The presence of a substituent in the allylic compound is crucial for this reaction. Without the substituent, (E)-dienylimines will be produced via the dimerization of the allylic compounds.
Asymmetric Synthesis of Functionalized Dihydronaphthoquinones Containing Quaternary Carbon Centers via a Metal-Free Catalytic Intramolecular Acylcyanation of Activated Alkenes
作者:Zhe Zhuang、Zhi-Peng Hu、Wei-Wei Liao
DOI:10.1021/ol501427h
日期:2014.6.20
metal-free catalytic annulation was developed through a Lewis base-catalyzed asymmetric allylic alkylation and the ensuing unprecedented asymmetric intramolecular acylcyanation of alkenes. This protocol provides a unique and facile access to prepare enantioenriched densely functionalized dihydronaphthoquinones accompanied by enantiomerically pure 3,3-disubstituted phthalides bearing quaternarycarbon centers
Facile synthesis of bisphosphine monoxides from Morita–Baylis–Hillman carbonates
作者:Rong Zhou、Kai Zhang、Rongfang Liu
DOI:10.1080/10426507.2015.1100192
日期:2016.6.2
GRAPHICAL ABSTRACT ABSTRACT A facile two-step synthesis of bisphosphine monoxides (BPMOs, with both the phosphine and phosphine oxide moieties within one molecule) from readily available Morita–Baylis–Hillman (MBH) carbonates was realized. Under the catalysis of DABCO, the MBH carbonates undergo allylic phosphorylation reaction with diphenylphosphine oxide or diethyl phosphonate to give monophosphine
Phosphine-catalyzed [3+3] annulation reaction of modified tert-butyl allylic carbonates and substituted alkylidenemalononitriles
作者:Suqing Zheng、Xiyan Lu
DOI:10.1016/j.tetlet.2009.05.085
日期:2009.8
A phosphine-catalyzed [3+3] annulation reaction of modified tert-butyl allylic carbonates with various alkylidenemalononitriles to form cyclohexenes was developed. The use of protic solvent is crucial in this reaction. When non-polar solvent, toluene or xylene, was used, only non-cyclized product was obtained. (C) 2009 Elsevier Ltd. All rights reserved.