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首页> 外文期刊>Organometallics >Access to central carbon chirality through cycloplatination of 1-(2-pyridinylthio)propanone by cis-[PtCl2(S-SOMe(p-tolyl))]. The crystal structure of (SsSc)-[Pt{py{SCHC(O)Me}-2}Cl(SOMe(p-tolyl))]
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Access to central carbon chirality through cycloplatination of 1-(2-pyridinylthio)propanone by cis-[PtCl2(S-SOMe(p-tolyl))]. The crystal structure of (SsSc)-[Pt{py{SCHC(O)Me}-2}Cl(SOMe(p-tolyl))]

机译:通过环-[PtCl2(S-SOMe(p-tolyl))]对1-(2-吡啶硫基)丙酮进行环铂反应获得中心碳手性。 (SsSc)-[Pt {py {SCHC(O)Me} -2} Cl(SOMe(p-tolyl))的晶体结构

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摘要

Cycloplatination of the prochiral sp(3)C-H bond of 1-(2-pyridinylthio)propanone (py(SCH2C(O)Me)(-2), 1a) by cis-[PtCl2(SOMe2)] in dry ethanol affords [Pt(py(SCHC(O)Me)-2)Cl(SOMe2)] (3a) in 77% isolated yield without any side product. The same reaction using the chiral complex cis-[PtCl2(S-SOMe(p-tolyl))] (the absolute configuration of sulfur is indicated for the coordinated ligand) leads to two cycloplatinated diastereoisomers, 4a (SsRc) and 4b (SsSc), in 12.9 and 33.7% yield, respectively (de 44.6%). Their absolute configuration was deduced from the analysis of the H-1 NMR spectra and confirmed by an X-ray structural investigation of 4b. Diastereomer 4b was shown to react with PPh3 to give the enantiomer [Pt(py(SCHC(O)Me)-2)Cl(PPh3)] with the central carbon chirality only. Rather surprisingly, attempted cycloplatination Of py(SCH2C(O)Ph)-2 (1b) by cis-[PtCl2(SOMe2)] affords the cycloplatinated complex [Pt(pyf(SCHC(O)Ph)-2)Cl(SOMe2)] (3b) in a miserable yield. [References: 21]
机译:在无水乙醇中通过顺式[PtCl2(SOMe2)]对1-(2-吡啶基硫基)丙酮(py(SCH2C(O)Me)(-2),1a)的前手性sp(3)CH键进行环铂电镀(py(SCHC(O)Me)-2)Cl(SOMe2)](3a)的分离产率为77%,无任何副产物。使用手性配合物顺式[[PtCl2(S-SOMe(p-tolyl))](指示配体的硫的绝对构型)进行的相同反应会生成两个环铂非对映异构体4a(SsRc)和4b(SsSc) ,产率分别为12.9和33.7%(降幅为44.6%)。它们的绝对构型是由H-1 NMR光谱分析得出的,并由4b的X射线结构研究证实。非对映体4b显示与PPh3反应,得到仅具有中心碳手性的对映体[Pt(py(SCHC(O)Me)-2)Cl(PPh3)]。出乎意料的是,尝试通过顺式[PtCl2(SOMe2)]对py(SCH2C(O)Ph)-2(1b)进行环铂电镀,得到环铂化的复合物[Pt(pyf(SCHC(O)Ph)-2)Cl(SOMe2) ](3b),收率很差。 [参考:21]

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