Alkylation of Alkenes: Ethylaluminum Sesquichloride-Mediated Hydro-Alkyl Additions with Alkyl Chloroformates and Di-<i>tert-</i>butylpyrocarbonate
作者:Ursula Biermann、Jürgen O. Metzger
DOI:10.1021/ja048904y
日期:2004.8.1
alkene; hydride transfer to the adduct carbeniumion or, if applicable, 1,2-H shift followed by hydride transfer from Et(3)Al(2)Cl(3) to the rearranged adduct carbeniumion gives the saturated addition product. The reaction has been applied to 1-alkenes, 2-methyl-1-alkenes, internal double bonds, and to three cyclic alkenes. Special interest has been focused on alkylations of unsaturated fatty compounds,
The antifungal antibiotics, neopetins A(1), B(2) and C(3), were found to be cyclic lipopeptides containing unusual amino acids, their structures being elucidated on the basis of chemical and spectroscopic evidence. They inhibited mannoprotein and β-1,3-glucan synthetases from Saccharomyces cerevisiae. The structure-biological activity relationship is discussed.