Tandem Michael−Wittig−Horner Reaction: One-Pot Synthesis of δ-Substituted α,β-Unsaturated Carboxylic Acid Derivatives − Application to a Concise Synthesis of (Z)- and (E)-Ochtoden-1-al
A new tandem Michael−Wittig−Horner reaction has been developed to produce in high yields δ-substituted α,β-unsaturated esters, amides and lactones. The reaction has been successfully applied to a concise synthesis of (E)- and (Z)-ochtoden-1-als, components of the male sex pheromone of boll weevil from 3-methylcyclohex-2-en-1-one.
In the presence of TiCl4 the 4 position of the title silyl ester reacts with such electrophiles as allylic ethers or bromides carrying the leaving group on the secondary carbon without allylic rearrangement.
Reactivity of substituted and unsubstituted diphenylphosphonium diylides towards carbonic acids derivatives
作者:H.J. Cristau、M. Taillefer
DOI:10.1016/s0040-4020(97)10360-x
日期:1998.2
delimit the scope of application of diphenylphosphonium diylides, their reactivity towards carbonicacid derivatives was investigated. Non-stabilized diylides react with ethyl carbonate to give new monoylide intermediates which lead, by in situ Wittig reaction with carbonyl compounds, to the synthesis of α,β-unsaturated esters or acids the double bond being di- or trisubstituted. The reaction proceeds in
Tandem Michael–Wittig–Horner Reaction: Application to the Synthesis of Bisabolanes
作者:Olivier Chuzel、Olivier Piva
DOI:10.1081/scc-120015768
日期:2003.1.3
Bisabolane derivatives have been synthesized from para-substituted cinnamaldehydes according to a tandem Michael-Wittig-Horner reaction. This sequence was applied to a short access to (+/-)-ar-turmerone.