‘GaI’: A new reagent for chemo- and diastereoselective C–C bond forming reactions
作者:Shaun P. Green、Cameron Jones、Andreas Stasch、Richard P. Rose
DOI:10.1039/b613669a
日期:——
was established from NMR spectroscopic and X-ray crystallographic studies of the products. When R = Me, the 2R,3S,4R/2S,3R,4S-enantiomeric pair is formed, whereas when R = Et or iPr, 2R, 3R, 4S/2S, 3S, 4R-diastereoisomers result. These differences are rationalised in terms of the likely transition states of the reactions. The same products are not formed when higher oxidation salts of gallium, or InI
“ GaI”在有机转化中作为还原剂的潜力,特别是涉及α-官能化的CC键形成反应 酮类,已被调查。最令人感兴趣的是α-烷氧基的非对映选择性羟醛偶联反应酮类,PhC(O)C(H)(OR)Ph,R = Me,Et或i Pr,得到新颖的γ-烷氧基,β-羟基酮类,PhC(O)C(H)(Ph)C(OH)(Ph)C(H)(OR)Ph,包含三个连续的立体中心。这些反应的非对映体选择性是根据核磁共振产品的光谱和X射线晶体学研究。当R = Me时,形成2 R,3 S,4 R / 2 S,3 R,4 S对映体对,而当R = Et或i Pr时,2 R,3 R,4 S / 2 S,得到3 S,4 R-非对映异构体。根据反应的可能过渡态合理化了这些差异。当使用镓或InI的高级氧化盐作为无机试剂时,不会形成相同的产物。“ GaI”对α-卤代的反应性酮类,1,2-二酮和不饱和的α,β 酮类也已经进行了探索。同样,将这些反