New hydrogen-bonding organocatalysts: Chiral cyclophosphazanes and phosphorus amides as catalysts for asymmetric Michael additions
作者:Helge Klare、Jörg M Neudörfl、Bernd Goldfuss
DOI:10.3762/bjoc.10.18
日期:——
catalysts based on open-chain P(V)-amides of BINOL and chinchona alkaloids as well as three catalysts based on rigid cis-P(V)-cyclodiphosphazane amides of N (1),N (1)-dimethylcyclohexane-1,2-diamine have been developed. Employed in the asymmetric Michael addition of 2-hydroxynaphthoquinone to beta-nitrostyrene, the open-chain 9-epi-aminochinchona-based phosphorusamides show a high catalytic activity
Dimethylaminolysis of dichlorophosphinothioyl compounds
作者:Gordon Bulloch、Rodney Keat、Norman H. Tennent
DOI:10.1039/dt9740002329
日期:——
investigated. When R = Me, mono-, non-geminal bis-, and tetrakis-dimethylamino-derivatives have been isolated, and the new ring compound (II), Me2N(S)[graphic omitted], obtained by reaction with 6 mol dimethylamine heated under reflux in chloroform solution. The analogous N-ethyl ring compound has been obtained from (I; R = Et). Attempts to synthesise the geminal bis(dimethylamino) derivatives, Cl2(S) P·NR·P(S)(NMe2)2
Generation of Ethyl Metathiophosphate by Thermal Fragmentation of <i>O</i>-Ethyl <i>N</i>-Substituted Phosphoramidothioates
作者:Louis D. Quin、Petr Hermann、Stefan Jankowski
DOI:10.1021/jo952270j
日期:1996.1.1
and found to fragment on heating in inert solvents to form the pyrophosphate AdNHP(S)(OEt)OP(S)(OEt)OH. The proposed mechanism involves an elimination of the amine portion with release of ethyl metathiophosphate (EtOP(S)O), as was confirmed in previous work for the comparable structure with oxygen. This transient compound then phosphorylates the starting phosphoramidothioate. O-Ethyl N,N-diethylphosphoramidothioate
Synthesis and properties of new dichlorophoshinothioyl-derivatives of amines
作者:R. Keat
DOI:10.1039/dt9720002189
日期:——
amines, [Cl2P(S)]2NR and Cl2PS·NR·PCl2(R = Me, Et, or Ph), have been prepared by reactions of the bis(dichlorophosphino)-amines, (Cl2P)2NR (R = Me, Et, or Ph), with elemental sulphur in the presence of anhydrous aluminium chloride. The compounds Cl2P(S)·NR·PCl2 eliminate PCl3 when heated leaving cyclodiphosphazanes, [R·NP(S)Cl]2. Dichlorophosphinothioyl(dichlorophosphinyl)amines, Cl2P(S)·NR·P(O)Cl2(R
GRAPHICAL ABSTRACT ABSTRACT N-Phenylphosphoramidothioic dichloride was successfully synthesized from the reaction of thiophosphoryl chloride and phenylamine. Ammonia was used as acid-binding agent in the reaction. The product was fully characterized by IR, NMR (1H, 13C, and 31P), and EA. Under the optimized conditions, the overall yield was 85%. There are many advantages for this synthesis method such
图形摘要 摘要 N-苯基硫代磷酰二氯是由硫代磷酰氯和苯胺反应成功合成的。氨在反应中用作酸结合剂。产物通过 IR、NMR(1H、13C 和 31P)和 EA 进行了充分表征。在优化条件下,总收率为85%。该合成方法具有合成工艺简单、生产成本低、副产物少等优点。