Substitution nucleophile d'acetates de cyclenols allyliques fonctionnels par des organometalliques en presence de sels cuivreux. Application a une synthese rapide de la (±)mitsugashiw alactone
作者:Hassen Amri、Monique Rambaud、Jean Villieras
DOI:10.1016/s0040-4020(01)81522-2
日期:1990.1
Substitution of functional allylic cycloalkenol acetates by Grignardreagents (primary , secondary, tertiary-alkyl, vinyl, aryl) in the presence of a catalytic amount (2.5% equivalent) of cuprous iodide at low temperature, gives high yields of various functional α-substituted cycloalkenes . The reaction can be applied to lithium enolates of esters and need no catalyst, but may be performed with HMPA
ortho-Acidic aromatic thiols as efficient catalysts of intramolecular Morita–Baylis–Hillman and Rauhut–Currier reactions
作者:Philipp S. Selig、Scott J. Miller
DOI:10.1016/j.tetlet.2010.11.077
日期:2011.4
ortho-Mercaptobenzoic acid and ortho-mercaptophenols were discovered as efficient thiol catalysts of both the intramolecular Morita–Baylis–Hillman (MBH) and Rauhut–Currier (RC) reaction. High reaction rates were achieved under mildly basic, aqueous conditions. The unprecedented catalytic activity of these protic nucleophiles could originate from a Brønsted acid induced destabilization of intermediate
La reaction de Wittig-Horner en milieu heterogene IX. Bis aldolisation des phosphonates a partir des dialdehydes aliphatiques en milieu aqueux peu basique. Synthese de cyclenols fonctionnels.
作者:M. Graff、A. Al Dilaimi、P. Seguineau、M. Rambaud、J. Villieras
DOI:10.1016/s0040-4039(00)84318-x
日期:1986.1
Aqueous solutions of glutaraldehyde and succinaldehyde give respectively improved yields of 1-functional 6-cyclohexenols and 5-cyclopentenols, when subjected to WITTIG-HORNER reaction in water at room temperature, with potassium carbonate as a base.