Synthesis and asymmetric catalytic activities of chiral organogallium and indium complexes with ephedrine derivatives as ligands. The crystal structure of [(1R, 2S)-(Me2Ga-μ-OCH(C6H5)CH(CH3)-μ-NHCH3)]2
作者:Fang Yuan、Chengjian Zhu、Jiangtao Sun、Yongjiang Liu、Yi Pan
DOI:10.1016/s0022-328x(03)00710-1
日期:2003.10
with (1R, 2S)-(−)-ephedrine derivatives afford compounds [(1R, 2S)-(Me2E-μ-OCH(C6H5)CH(CH3)-μ-NRCH3)]2 [E=Ga, R=H (1), CH3 (2), CH2Ph (3); E=In, R=H (4), CH3 (5), CH2Ph (6)] in high yields. The resulting complexes 1–6 have been characterized by 1H-NMR spectroscopy and elemental analysis. Structure of the compound 1 determined by single-crystal X-ray analysis shows a dimeric feature containing a standard
The first example of enantioselective isocyanosilylation of meso epoxides with TMSCN catalyzed by novel chiral organogallium and indium complexesElectronic supplementary information (ESI) available: Characterization data, chiral analysis and determination of absolute configuration. See http://www.rsc.org/suppdata/cc/b2/b212511k/
作者:Chengjian Zhu、Fang Yuan、Weijin Gu、Yi Pan
DOI:10.1039/b212511k
日期:2003.3.6
The desymmetrization ring opening of meso epoxides using trimethylsilyl cyanide catalyzed by organogallium and indium complexes with binaphthol monoether derivatives as chiral ligands gave beta-isocyanohydrins with moderate to excellent enantioselectivities of up to 95% ee.
使用有机镓和铟配合物与联萘酚单醚衍生物作为手性配体催化的内消旋环氧化物的去对称开环得到具有高达 95% ee 的中等至优异对映选择性的 β-异氰醇。
Efficient one-pot synthesis of functionalised imidazo[1,2-<i>a</i>]pyridines and unexpected synthesis of novel tetracyclic derivatives by nucleophilic aromatic substitution
作者:Charles R. K. Changunda、B. C. Venkatesh、William K. Mokone、Amanda L. Rousseau、Dean Brady、Manuel A. Fernandes、Moira L. Bode
DOI:10.1039/c9ra10447j
日期:——
Novel tetracyclic imidazo[1,2-a]pyridine derivatives have been prepared by intramolecular nucleophilic aromatic substitution of 5-fluoroimidazo[1,2-a]pyridines under basic conditions. Use of the non-nucleophilic alcoholic solvent tert-butanol, rather than methanol, increased the yield of the tetracycles by reducing the competing intermolecular reaction observed for methanol. In addition, a modified
5-氟咪唑并[1,2- a ]吡啶在碱性条件下通过分子内亲核芳香取代制备了新型四环咪唑并[1,2- a ]吡啶衍生物。使用非亲核醇溶剂叔丁醇而不是甲醇,通过减少对甲醇观察到的竞争性分子间反应,提高了四环化合物的产率。此外,已发现甲酰胺脱水生成异氰化物的改进方案可耐受未受保护的羟基官能团,并报道了一锅转化为咪唑并[1,2 - a ]吡啶基-氨基环己醇类似物。
Cambie, Richard C.; Rutledge, Peter S.; Tan, Vivien Y. Y., Journal of Chemical Research, Miniprint, 1984, # 12, p. 3655 - 3694
作者:Cambie, Richard C.、Rutledge, Peter S.、Tan, Vivien Y. Y.、Woodgate, Paul D.
DOI:——
日期:——
Opening of epoxides with trimethylsilyl cyanide to produce .beta.-hydroxy isonitriles. A general synthesis of oxazolines and .beta.-amino alcohols