Efficient methods for enol phosphate synthesis using carbon-centred magnesium bases
作者:William J. Kerr、David M. Lindsay、Vipulkumar K. Patel、Muralikrishnan Rajamanickam
DOI:10.1039/c5ob01849h
日期:——
Efficient conversion of ketones into kinetic enolphosphates under mild and accessible conditions has been realised using the developed methods with di-tert-butylmagnesium and bismesitylmagnesium. Optimisation of the quench protocol resulted in high yields of enolphosphatesfrom a range of cyclohexanones and aryl methyl ketones, with tolerance of a range of additional functional units.
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
Gold(I)-Catalyzed Addition of Diphenyl Phosphate to Alkynes: Isomerization of Kinetic Enol Phosphates to the Thermodynamically Favored Isomers
作者:Phil Ho Lee、Sundae Kim、Aeri Park、Bathoju Chandra Chary、Sunggak Kim
DOI:10.1002/anie.201001799
日期:2010.9.10
Gold, gold, or …︁ gold? It depends on the (gold) catalyst whether the product of thermodynamic or kinetic control is formed in an unprecedented hydrophosphoryloxylation approach to enolphosphates (see scheme). A third catalyst, [(C6F5)3PAuOTf], was found to be exceedingly effective for the previously unknown isomerization of kineticenolphosphates to the thermodynamicallyfavoredisomers. Tf=tri
黄金,黄金还是…︁黄金?是否以空前的烯醇磷酸盐加氢磷酰氧基化方法形成热力学或动力学控制产物取决于(金)催化剂(参见方案)。发现第三种催化剂[(C 6 F 5)3 PAuOTf]对于动力学烯醇磷酸酯到热力学上有利的异构体的以前未知的异构化非常有效。Tf =三氟甲磺酰基;R =烷基,环己基,Ph。
Synthesis of Conjugated Dienol Phosphates
作者:Grzegorz Blotny、Ralph M. Pollack
DOI:10.1055/s-1988-27482
日期:——
Conjugated dienol phosphates substituted at either the 1 or 2 position can be prepared from α,β- or β,γ-unsaturated ketones by treatment with lithium tetramethylpiperidine and a dialkyl or diaryl chlorophosphate. Simple enol phosphates can also be synthesized by this method.
The title reaction in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium(0) affords alkylative coupling products in good to excellent yields in 1,2-dichloroethane at room temperature. This coupling reaction under C(sp2)–O cleavage proceeds stereospecifically. The reaction does not affect a coexisting vinyl sulfide group. This feature enables 1,2- and 1,3-carbonyl transposition