Asymmetric reactions catalyzed by chiral metal complexes. XXXVIII. Efficient asymmetric hydrogenation of (Z)-2-acetamidocinnamic acid catalyzed by the rhodium complex of modified N-benzyl-(3R,4R)-3,4-bis(diphenylphosphino)pyrrolidine (Degphos).
A new method for the preparation of a stable 1-hydroxy-2,4,6,8-tetrakis(t-butyl)phenoxazin-10-yl radical by oxidation of 3,5-di-t-butyl-ortho-aminophenol with 3,5-di-t-butyl-ortho-benzoquinone is reported. Interaction of the radical with the coordination or the organic compounds of various metals has been studied.
Synthesis of alkyl phosphinic acids from silyl phosphonites and alkyl halides
作者:E.Andrew Boyd、Andrew C. Regan、Keith James
DOI:10.1016/s0040-4039(00)73157-1
日期:1994.6
Mono- and di-substituted phosphinic acids have been synthesised in a one-pot reaction, by the addition of alkyl halides to silyl phosphonites, under mild and flexible conditions.
N-(dialkylphosphinoyl)hydroxylamines : Preparation using N,O-bis(trimethylsilyl)hydroxylamine and migration of simple alkyl groups in the rearrangements of their O-p-nitrobenzenesulphonates
作者:Martin J.P. Harger、P.Andrew Shimmin
DOI:10.1016/s0040-4020(01)90367-9
日期:1992.9
Treatment of Pri2P(O)Cl with Me3SiNHOSiMe3 gives Pri2P(O)NHOSiMe3, which is desilylated by methanol giving Pri2P(O)NHOH. The O-p-nitrobenzenesulphonyl derivative of this rearranges with KOBut in ButOH, an isopropyl group migrating from P to N and the phosphonamidate PriP(O)(OBut)NHPri being formed quantitatively. Rearrangement also occurs in other alcohols (MeOH, EtOH, PriOH), but not quite as cleanly
用Me 3 SiNHOSiMe 3处理Pr i 2 P(O)Cl产生Pr i 2 P(O)NHOSiMe 3,其被甲醇甲硅烷基化,得到Pr i 2 P(O)NHOH。所述ø - p此重排用的甲部衍生物-nitrobenzenesulphonyl吨在卜吨OH,异丙基迁移从P到N和镨的磷酰胺酯我P(O)(OBU吨)NHPr我被定量地形成。重排也发生在其他的醇(甲醇,乙醇,镨我OH),但不是很干净。在卜Ť NH2所述phosphinoylhydrazine镨我2 P(O)NHNHBu吨形成以及重排产物,镨我P(O)(NHBu吨)NHPr我。与Me 3 SiNHOSiMe 3相似地制备的Et 2 P(O)NHOH和Pr i MeP(O)NHOH的对硝基苯磺酰基衍生物也与Bu t OH-KOBu t进行了定量重排。在后一种情况下,两个烷基(Pr i和Me)的迁移能力几乎相同。