Base-Controlled Selective Conversion of Michael Adducts of Malonates with Enones in the Presence of Iodine
作者:Chun-Bao Miao、Min Zhang、Zong-Yong Tian、Hai-Tao Xi、Xiao-Qiang Sun、Hai-Tao Yang
DOI:10.1021/jo201879t
日期:2011.12.2
An efficient base-controlled selective conversion of the Michael adducts of malonates with enones in the presence of iodine is reported. Highly functionalized cyclopropane, oxetane, and α-hydroxylmalonate derivatives are obtained selectively using DBU, Na2CO3, and NaOAc as the base, respectively. O2 was identified to be crucial to the formation of oxetane and α-hydroxylmalonate derivatives.
据报道在碘存在下,丙二酸酯的迈克尔加成物与烯酮的有效的碱控制的选择性转化。分别使用DBU,Na 2 CO 3和NaOAc作为碱分别选择性地获得高度官能化的环丙烷,氧杂环丁烷和α-羟基丙二酸酯衍生物。O 2被确定对于氧杂环丁烷和α-羟基丙二酸酯衍生物的形成至关重要。
I<sub>2</sub>-Catalyzed Direct α-Hydroxylation of β-Dicarbonyl Compounds with Atmospheric Oxygen under Photoirradiation
作者:Chun-Bao Miao、Yan-Hong Wang、Meng-Lei Xing、Xin-Wei Lu、Xiao-Qiang Sun、Hai-Tao Yang
DOI:10.1021/jo401866p
日期:2013.11.15
An I2-catalyzed hydroxylation of β-dicarbonyl moieties using air as the oxidant under photoirradiation has been developed for the easy preparation of α-hydroxy-β-dicarbonyl compounds. The transformation was completed with only 1 mol % of I2. With α-unsubstituted malonates, the hydroxylated dimerization product was afforded as the predominant product along with a minor product, α,α-dihydroxyl malonate
Solvent-Controlled Oxidative Cyclization for Divergent Synthesis of Highly Functionalized Oxetanes and Cyclopropanes
作者:Yang Ye、Chen Zheng、Renhua Fan
DOI:10.1021/ol9012102
日期:2009.7.16
An efficient solvent-controlled oxidative cyclization of Michael adducts of malonates with chalcones with the combination of iodosobenzene and tetrabutylammonium iodide is reported. Highly functionalized oxetanes and cyclopropanes were divergently synthesized in moderate to excellent yields with high diastereoselectivity.