The trifluoromethylation of lithium enotates of chiral N-acyloxazolidinones with iodotriftuoromcthane mediated by triethylborone proceeds with good diastereomeric excess.
A formal synthesis of (+)milbemycin β31: A Wittig approach
作者:Raymond Baker、Mary J. O'Mahony、Christopher J. Swain
DOI:10.1016/s0040-4039(00)84716-4
日期:1986.1
generate the C14–C15 trisubstituted double bond of milbemycin β3 by reaction of a Wittig reagent with the appropriate spiroacetal aldehyde. The product of this reaction, after conversion to the iodide and enantiospecific alkylation to generate the C12 methyl group, has been elaborated to an intermediate previously involved in a total synthesis of milbemycin β3.
Baker, Raymond; O'Mahony, Mary J.; Swain, Christopher J., Journal of the Chemical Society. Perkin transactions I, 1987, p. 1623 - 1634
作者:Baker, Raymond、O'Mahony, Mary J.、Swain, Christopher J.
DOI:——
日期:——
Structure and reactivity of lithium diisopropylamide (LDA) in hydrocarbon solutions. Formation of unsolvated ketone, ester, and carboxamide enolates
作者:Yong Joo Kim、Max P. Bernstein、Angela S. Galiano Roth、Floyd E. Romesberg、Paul G. Williard、David J. Fuller、Aidan T. Harrison、David B. Collum
DOI:10.1021/jo00014a019
日期:1991.7
Enolization of ketones, tert-butyl esters, and carboxamides by solvent-free lithium diisopropylamide (LDA) in hexane or toluene are described. Enolates are isolated as spectroscopically pure, white (often crystalline) solids. Solubilities of the enolates in hexane range from highly soluble to completely insoluble. Enolizations of aldehydes, methyl esters, and acetone afford complex mixtures. Analysis of [Li-6]LDA and [Li-6, N-15]LDA in hexane by Li-6 and N-15 NMR spectroscopy show evidence of an equilibrium mixture of at least three cyclic oligomers.
Synthesis of 3,3-dichloro-2-fluoroacrylic esters by thermal opening of alcoxy perhalogeno cyclopropanes