Stereochemistry of the Horner-Emmons reaction between 3-functionally substituted 2-methyl-2-propenylphosphonates and aliphatic aldehydes. 4. Effect of the nature of the aliphatic aldehyde and concentration of the starting reagents
作者:G. V. Kryshtal'、�. P. Serebryakov、L. M. Suslova、L. A. Yanovskaya
DOI:10.1007/bf00962399
日期:1990.6
The double bond formed in the Horner-Emmons reaction has only E configuration independently of the structure of the saturated linear, alpha-branched, and beta-branched aliphatic aldehydes upon their reaction with the diethyl ester of 3-ethoxycarbonyl-2-methyl-2-propenylphosphonic acid, while the ratio of the 2E, 4E and 2Z,4E isomers in the reaction product varies only from 58:42 to 62:38. An increase in the aldehyde concentration leads to an increase in the fraction of the 2Z,4E isomer in the ethyl ester of 2E/Z,4E-3,7-dimethyl-2,4-octadienoic acid formed.