Conditions for metalation of a variety of cyclic vinylethers and reaction of the resulting carbanions with electrophiles are described. Effects of the vinylether structure on the relative rates of metalation are discussed. Applications of this methodology to the construction of various types of carbonyl compounds are presented.
Ethyl 2- methyl-4-oxocyclohex-2-enecarboxylate (Hagemann's ester) as a precursor to alkyl-substituted 3-methylcyclohexenones
作者:Bruce A. McAndrew
DOI:10.1039/p19790001837
日期:——
from ethyl 2-methyl-4-oxocyclohex-2-enecarboxylate (Hagemann's ester)via the alkylation of its ethylene glycol acetal. Various routes to 6-alkyl-3-methylcyclohex-2-enones from Hagemann's ester have been explored; a particularly convenient route to these unsaturated ketones utilised the isomeric keto-ester, ethyl 4-methyl-2-oxocyclohex-3-enecarboxylate as starting material. The alkylation of ethyl 2-
Strategic synthesis based on cyclohexadienes: preparation of 2-, 2,3- and 2,4-substituted cyclohexenones; synthesis of (Z)-heneicosa-6-en-11-one
作者:Kakumanu Pramod、Halasya Ramanathan、G. S. R. Subba Rao
DOI:10.1039/p19830000007
日期:——
good yield. Arylation of the above mesomeric anions followed by hydrolysis afforded 2-arylcyclohex-2-enones in addition to substituted biphenyls. A new and efficient synthesis of the male sexattractant of the DouglasFirTussockMoth, (Z)-heneicosa-6-en-11-one is described using the above methodology.