Mechanism of the reaction of trialkyl phosphites with α-halogenoacetophenones in alcoholic solvents
作者:Imre Petneházy、György Keglevich、László Tőke、Harry R. Hudson
DOI:10.1039/p29880000127
日期:——
suggested betaine as a common intermediate in alcoholic solution. Further reaction then involvesrearrangement to give the vinyloxyphosphonium species (and hence the Perkow product) or protonation followed by dealkylation to give the α-hydroxyphosphonate. Evidence for the possible formation of dehalogenated ketone via solvolysis of the α-hydroxyphosphonium intermediate is also presented.
Selective Alkenylation and Hydroalkenylation of Enol Phosphates through Direct CH Functionalization
作者:Xu‐Hong Hu、Xiao‐Fei Yang、Teck‐Peng Loh
DOI:10.1002/anie.201506437
日期:2015.12.14
Rh‐catalyzed direct CH functionalization reaction of enol phosphates was developed. The method is applicable to a variety of coupling partners, including activatedalkenes, alkynes, and allenes, and leads to the formation of various valuable alkenylated and hydroalkenylated enol phosphates through the action of the phosphate directing group. The versatility and utility of the coupling products were demonstrated
Base-Mediated Tandem Reaction of α-Aryloxyacetophenones with Phosphonates: Selective Synthesis of Enol Phosphates
作者:Ye-Xiang Xie、Jin-Heng Li、Ren-Jie Song、Yan-Yun Liu、Ji-Cheng Wu、Guo-Bo Deng、Xu-Heng Yang、Yu Liu
DOI:10.1055/s-0031-1289717
日期:2012.4
A new, simple method for the synthesis of enol phosphates by base-mediated tandem reaction of α-aryloxyacetophenones with phosphonates is described. In the presence of Cs2CO3, a variety of α-aryloxyacetophenones smoothly underwent the sequential O-P bond-forming/C-O bond cleavage/isomerization tandem reaction with phosphonates at room temperature, providing the corresponding enol phosphates in moderate to excellent yields.
Solvent-Enabled Radical Selectivities: Controlled Syntheses of Sulfoxides and Sulfides
作者:Huamin Wang、Qingquan Lu、Chaohang Qian、Chao Liu、Wei Liu、Kai Chen、Aiwen Lei
DOI:10.1002/anie.201508729
日期:2016.1.18
Controllingselectivity is of central importance to radical chemistry. However, the highly reactive and unstable radical intermediates make this task especially challenging. Herein, a strategy for taming radical redox reactions has been developed, in which solvent‐bonding can alter the reactivity of the generated radical intermediates and thereby drastically alter the reaction selectivity at room temperature
Synthesis of enol phosphates directly from ketones <i>via</i> a modified one-pot Perkow reaction
作者:Huichuang Guo、Yulong Zhang、Zhenya Li、Peichao Zhao、Ning Li、Enxue Shi
DOI:10.1039/d2ra02340g
日期:——
A modified Perkow reaction was developed based on the one-pot α-tosyloxylation of ketones following by addition of P(iii)-reagents and 4 Å molecular sieves.
改进的 Perkow 反应基于酮的一锅 α-甲苯磺酰氧基化,随后添加 P(iii)-试剂和 4 Å 分子筛。