Free-Radical Variant for the Synthesis of Functionalized 1,5-Diketones
作者:Kelvin Kau Kiat Goh、Sunggak Kim、Samir Z. Zard
DOI:10.1021/ol402213k
日期:2013.9.20
A free-radical approach for the synthesis of functionalized 1,5-diketones has been accomplished through an effective combination play between alkenylacylphosphonates and keto-xanthates as radical surrogates of enolates and enones, respectively.
β Elimination of a phosphonate group from an alkoxyl radical — Intramolecular acylation using acylphosphonate derivatives as carbonyl group acceptors
作者:Chang Ho Cho、Sunggak Kim
DOI:10.1139/v05-099
日期:2005.6.1
possibility of β elimination of a phosphonate group in radical reactions was studied. The facile β elimi- nation of the phosphonate group from an alkoxyl radical was observed for the first time, whereas the β elimination of the phosphonate group from an aminyl and an alkyl radical did not occur. On the basis of our findings, the use of an acylphosphonate as a carbonylgroup radical acceptor was investigated.
研究了自由基反应中膦酸酯基团 β 消除的可能性。首次观察到从烷氧基自由基轻松β消除膦酸酯基团,而未发生从氨基和烷基自由基β消除膦酸酯基团。基于我们的发现,研究了使用酰基膦酸酯作为羰基自由基受体。在苯中的六甲基二锡存在下,在 300 nm 处,酰基膦酸酯的自由基环化,以高产率获得 ac yclopentanone 或环己酮衍生物,而不会形成直接还原产物。该反应可以在类似条件下在催化量的六甲基二锡(0.2当量)存在下进行。此外,烷基膦酰硫代甲酸酯基团可以作为烷基硫代羰基基团等价的自由基受体,为硫代内酯的合成提供了方便的途径。简历 : 在一个 etudie la possibilite d'une 消除 β d'un groupe phosphonate au cours de reactor radicalaires。在观察上,pour la Premiere fois une 消除 β facile
β-Elimination of a Phosphonate Group from an Alkoxy Radical: An Intramolecular Acylation Approach Using an Acylphosphonate as a Carbonyl Group Acceptor
作者:Sunggak Kim、Chang Ho Cho、Chae Jo Lim
DOI:10.1021/ja036499p
日期:2003.8.1
On the basis of facile beta-elimination of a phosphonate group from an alkoxy radical, intramolecular acylation reaction has been developed, in which an acylphosphonate is used as an excellent carbonyl group radical acceptor.
Cobalt-catalyzed cyclization with the introduction of cyano, acyl and aminoalkyl groups
作者:Hiroto Hori、Shigeru Arai、Atsushi Nishida
DOI:10.1039/c9ob00637k
日期:——
An efficient synthesis of carbo- and heterocycles using CC, CO and CN bonds undercobaltcatalysis is described. The substituents on olefins are key for controlling the regio- and chemoselectivity in the initial hydrogen atom transfer step and quaternary carbons are efficiently constructed under mild conditions. Cyclopropane cleavage and tandem cyclization give highly functionalized bicyclic skeletons