Total Synthesis of Anti-Influenza Agents Zanamivir and Zanaphosphor via Asymmetric Aza-Henry Reaction
作者:Long-Zhi Lin、Jim-Min Fang
DOI:10.1021/acs.orglett.6b02131
日期:2016.9.2
The potent anti-influenza agents, zanamivir and its phosphonate congener, are synthesized by using a nitro group as the latent amino group at C4 for asymmetricaza-Henryreaction with a chiral sulfinylimine, which is derived from inexpensive d-glucono-δ-lactone to establish the essential nitrogen-containing substituent at C5. This method provides an efficient way to construct the densely substituted
Rare-earth metal amido complexes supported by bridged bis(β-diketiminato) ligand as efficient catalysts for hydrophosphonylation of aldehydes and ketones
A series of rare-earth metal amides supported by a cyclohexyl-linked bis(β-diketiminato) ligand were synthesized, and their catalytic activities for hydrophosphonylation of aldehydes and ketones were developed. Reaction of [(Me3Si)2N]3RE(µ-Cl)Li(THF)3 with the cyclohexyl-linked bis(β-diketimine) H2L (1) (L = Cy[NC(Me)CHC(Me)NAr]2, Cy = cyclohexyl, Ar = 2, 6-i-Pr2C6H3) gave the rare-earth metal amides
合成了一系列由环己基连接的双(β-二酮亚胺基)配体负载的稀土金属酰胺,并开发了它们对醛和酮进行氢膦酰化的催化活性。[(Me 3 Si)2 N] 3 RE(µ-Cl)Li(THF)3与环己基连接的双(β-二酮亚胺)H 2 L(1)(L = Cy [NC(Me)CHC (Me)NAr] 2,Cy =环己基,Ar = 2,6 - i -Pr 2 C 6 H 3)得到稀土金属酰胺LREN(SiMe 3)2(RE = Nd(2),Sm(3),Dy(4),Er(5),Y(6))。所有复合物均通过元素,光谱和单晶X射线分析得到充分表征。配合物的催化性能研究表明,在稀土金属酰胺(0.1-1 mol%)的室温下,负载量非常低的情况下,这些配合物对醛和酮的氢膦酰化反应显示出高催化活性。短时间。
Rhodium-Catalyzed Direct C-H Phosphorylation of (Hetero)arenes Suitable for Late-Stage Functionalization
作者:Minsik Min、Dahye Kang、Sungwoo Jung、Sungwoo Hong
DOI:10.1002/adsc.201600014
日期:2016.4.14
Efficient rhodium‐catalyzed direct C–H phosphorylation of (hetero)arenes was developed. Various directing groups and a wide range of substrates, including heterocycles, can be utilized in this C–H phosphorylation process, allowing for the rapid installation of the phosphonate group into medicinally and biologically important privileged scaffolds. The efficient and straightforward method could serve
The Preparation of Dialkyl 1-Hydroxyalkylphosphonates in the Reaction of Trialkyl Phosphites with Oxonium Salts Derived from Aldehydes or Ketones
作者:Mirosław Soroka、Waldemar Goldeman
DOI:10.1055/s-2006-950200
日期:——
The reaction of trialkylphosphites with aldehydes or ketones in the presence of hydrogen chloride gives dialkyl 1-hydroxy-alkylphosphonates via Arbusov-like reaction of oxonium salts derived from aldehydes or ketones. This reaction is a very convenient instant method for the preparation of dialkyl 1-hydroxyalkyl-phosphonates with a good yield as an alternative to the well-known Abramov reaction.
Nucleophilic addition to carbonyl compounds. competition between hard (amine) and soft (phosphite) nucleophile
作者:Roman Gancarz
DOI:10.1016/0040-4020(95)00634-k
日期:1995.9
reaction mixture, two nucleophiles: dialkyl phosphite and the amine compete for the electrophilic carbonylcompound. Reaction mixture composition studies, kinetic studies as well as theoretical calculations, indicate that the softer the carbonylcompound is, the faster it reacts with the softer phosphorus nucleophile and the slower it reacts with the harder amine nucleophile. It in turn results in