Reactivities of mixed organozinc and mixed organocopper reagents, 2. Selective n-alkyl transfer in tri-n-butylphosphine-catalyzed acylation of n-alkyl phenylzincs; an atom economic synthesis of n-alkyl aryl ketones
作者:Ender Erdik、Özgen Ömür Pekel
DOI:10.1016/j.tetlet.2009.01.082
日期:2009.4
Tri-n-butylphosphine-catalyzed acylation of mixedn-alkyl phenylzincs with aromatic acyl halides in THF is efficient in selective transfer of n-alkyl groups to produce n-alkylaryl ketones in good yields. This route provides an atom economic organocatalyzed alternative to transition metal-catalyzed acylation of di-n-alkylzincs.
A Convenient Synthesis of Acyclic 1,n-Diketones (n = 5-8) from 2-<i>t</i>-Butylperoxycycloalkanones
作者:Akira Nishinaga、Katsuhiko Rindo、Teruo Matsuura
DOI:10.1055/s-1986-31866
日期:——
The reaction of organolithium with 2-alkyl-2-t-butylperoxycycloalkanones, readily available from t-butylperoxylation of 2-alkylcycloalkanones, gave 2-t-butylperoxy-1-cycloalkanol derivatives quantitatively, thermal decomposition of which with or without an acid afforded 1,n-diketones (n = 5-8) in excellent yields.
Total Synthesis of Brevetoxin B. 1. First Generation Strategies and New Approaches to Oxepane Systems
作者:K. C. Nicolaou、C.-K. Hwang、M. E. Duggan、D. A. Nugiel、Y. Abe、K. Bal Reddy、S. A. DeFrees、D. R. Reddy、R. A. Awartani
DOI:10.1021/ja00146a008
日期:1995.10
The fust generation strategies toward the totalsynthesis of brevetoxin B (1) are presented and the syntheses of the key intermediates 3, 4, 5, 67, 83, and 94-98 required for the projected construction are described. The earliest and most convergent strategy required the application of the hydroxy epoxide cyclization and the intramolecular conjugate addition as key reactions for the construction of
Direct formation of functionalized ketones via the coupling of functionalized organocopper reagents with acid chlorides
作者:Richard M. Wehmeyer、Reuben D. Rieke
DOI:10.1016/s0040-4039(00)80534-1
日期:1988.1
reactive copper solutions have been prepared by the lithium naphthalide reduction of a copper(I) iodide/triphenyl-phosphine complex. These copper solutions react rapidly with functionalized alkyl halides to give organocopper reagents which have been effectively trapped with acid chlorides giving functionalized ketones in good yields. Ester, nitrile, chloride, remote epoxide, and, to some degree, ketone groups
Unsymmetrical 1,6-diketones were obtained by the copper(II) bromide-lithium t-butoxide oxidation of 1,2-disubstituted 1,2-cyclohexanediols. The diols were easily prepared by the addition of Grignard reagents to 2-trimethylsiloxy-2-cyclohexenone followed by the hydrolysis and treatment of the resulting 2-hydroxycyclohexanones with the second Grignard reagents. Similarly, 1,5-Diketones were obtained using 2-trimethylsiloxy-2-cyclopentenone as a starting material.