Hybrid Birch-Claisen Methodology for arylation at allylic termini: synthesis of (±)-herbertene
作者:S. Chandrasekaran、John V. Turner
DOI:10.1016/s0040-4039(00)87711-4
日期:1982.1
A hybrid Birch-Claisen methodology has been developed for the regio- and stereo-controlled arylation of allyl groups, and applied to a synthesis of (±)-herbertene.
Conversion of 1,4-Dihydrobenzoic Acids to Polyformylbenzenes under Vilsmeier Reaction Conditions
作者:B. Raju、G. S. Krishna Rao
DOI:10.1055/s-1987-27890
日期:——
1,4-Dihydrobenzoic acids 1a-e are converted by a one-pot reaction to benzene- mono-, di- and tricarboxaldehydes under Vilsmeier reaction conditions in yields ranging from 6 to 65%. The same methodology also serves to give naphthalene-1,3-dicarboxaldehyde (2f) from 1,4-dihydro-1-naphthoic acid (1f) in 91% yield.
Synthesis based on cyclohexadienes. Part 23.1 Total synthesis of 5-epi-pupukean-2-one
作者:Krishna Kaliappan、G. S. R. Subba Rao
DOI:10.1039/a704312k
日期:——
A new strategy for the construction of the isotwistane skeleton is reported from easily available cyclohexadienes which involves stereoselective alkylation of a bicyclooctenone derivative and a decarboxylative 5-exo-trig radical cyclisation as the key steps in the total synthesis of 5-epi-pupukean-2-one.
Enantioselective Enolate Protonation with Chiral Anilines: Scope, Structural Requirements, and Mechanistic Implications
作者:E. Vedejs、A. W. Kruger、N. Lee、S. T. Sakata、M. Stec、E. Suna
DOI:10.1021/ja994437m
日期:2000.5.1
substitution at the γ-carbon, γ-protonation can be a competing reaction in the case of the aliphatic substrates 12, 14b, 14d, and 18. The evidence is most consistent with a mechanism that involves proton transfer from 1a to a mixed aggregate consisting of enolate 4a and the lithiated amide 5, but direct proton transfer from 1a to the enolate is not ruled out.
Vinyl radical induced Michael additions: Total synthesis of (±)-seychellene
作者:K.Vijaya Bhaskar、G.S.R.Subba Rao
DOI:10.1016/s0040-4039(00)95166-9
日期:1989.1
A new strategy for the totalsynthesis of (±)-seychellene which involves (i) a regiospecific construction of a bicyclo(2.2.2)octene moiety having a methyl group at the bridgehead and (ii) a vinyl radical induced intramolecular Michael addition is described.