The Synthesis of Cyclic Enol Ethers via Molybdenum Alkylidene-Catalyzed Ring-Closing Metathesis
摘要:
An efficient method for the construction of five- and six-membered cyclic vinyl ethers from unsaturated esters using stoichiometric titanium reagents to convert the esters to acyclic olefinic enol ethers which are then transformed to the desired products by catalytic ring-closing olefin metathesis with a molybdenum alkylidene complex is described.
An Efficient Synthesis of Ketone Enol Ethers Mediated by<i>N</i>-(1-Alkoxyalkyl)benzotriazoles
作者:Alan R. Katritzky、Shibli I. Bayyuk、Stanislaw Rachwal
DOI:10.1055/s-1991-26446
日期:——
A new general method for the transformation of ketones into their enol ethers in good yield is developed via elimination of benzotriazole from N-(1-alkoxyalkyl)benzotriazole intermediates.
Methylenecyclopentane annulation via formal [3 + 2] cycloaddition reaction
作者:Yoshinori Takahashi、Keiji Tanino、Isao Kuwajima
DOI:10.1016/0040-4039(96)01283-x
日期:1996.8
A new method for methylenecyclopentane annulation via formal [3+2] cycloaddition reaction was developed. Under the influence of Lewis acids, enol ethers and vinylsulfides were treated with I-(alkylthio)-2-(trimethylsilylmethyl)allyl esters 1a or 1b to afford methylenecyclopentanes in good yields. The reaction proceeds with almost complete regioselectivity as well as high stereoselectivity.
The present invention relates to an improved process for preparing 4-substituted resorcinol derivatives, and intermediate compounds useful in the preparation of such resorcinol derivatives.