In the presence of catalytic amount of In(OTf)_3(10 mol%),a series of aldimines reacted with tetraallyltin in a 2:1 molar ratio to afford the corresponding homoallylic amines in good yields.The good atom efficiency was achieved under mild reaction conditions and a new protocol(allyl)_4Sn/In(OTf)_3 for simple imines was developed.
Xiao Ning Wei Ling Yan Liu Bing Wang Wei Xing Chang Jing Li
By investigating the effect of the amount of water, the ratio of aldehyde and allyl- bromide, and the reaction temperature on the transformation, 2,4,6-trisubstituted tetrahydro- pyrans are synthesized by a novel tandem Barbier-Prins-cyclization reaction in the presence of micro-amount of water under mild conditions. The experiment is easy to perform without the need to exclude moisture or air. The reaction is atomic economical and environmentally benign.
A facile and credible strategy was demonstrated to synthesize two new Sn-O clusters 1 and 2 by the reactions of nBu2SnO with esters directly under mild conditions.Cluster 1 crystallizes in the triclinic system,space group P1 with a = 13.054(3),b = 13.137(3),c = 15.077(3) ,α = 80.009(9),β = 77.187(10),γ = 76.075(11)°,Z = 2,V = 2427.3(9) 3,Dc = 1.565 g/cm3,μ(MoKα) = 2.076 mm-1,F(000) = 1152,the final R = 0.0335 and wR = 0.0664 for 9416 observed reflections(I > 2σ(I)).Cluster 2 belongs to the monoclinic system,space group P21/c with a = 13.673(3),b = 13.342(3),c = 16.296(4) ,β = 104.385(5)o,Z = 4,V = 2879.7(10) 3,Dc = 1.347 g/cm3,μ(MoKα) = 1.751 mm-1,F(000) = 1176,the final R = 0.0306 and wR = 0.0706 for 6390 observed reflections(I > 2σ(I)).The crystal structures of the clusters consist of cen-trosymmetric [RCOOSnnBu2OSnnBu2OH)]2 molecules with an almost planar Sn4O4 framework.Each pair of exo-and endo-cyclic tin atoms was linked by one bridge-OH only.In addition,a novel structure of nBu2SnO different from the previous reports was proposed on the basis of 1H-NMR,TG analysis and X-ray diffraction.
＜正＞Allylation of carbonyl groups by various allylic metals is a highly efficient tool for synthesizing homoall...
LIU, Ling-Yan TANG, Long YU, Lei CHANG, Wei-Xing LI, Jing (State Key Laboratory of Elemento-Organic Chemistry, Institute of Elemento-Organic Chemistry, Nankai University, Tianjin 300071)
