A New Halogen-Exchange Reaction between Sn–F and Li–X: Selective 1,2- and 1,4-Reductions of<i>α,β</i>-Unsaturated Ketones and Effects of Halogen Substituents on the Regioselectivity of Organotin Hydrides
作者:Takayo Moriuchi-Kawakami、Haruo Matsuda、Ikuya Shibata、Masato Miyatake、Toshihiro Suwa、Akio Baba
DOI:10.1246/bcsj.72.465
日期:1999.3
We have found that halogen-exchange occurs effectively between Sn–F and Li–X (X = I, Br, Cl) in tin hydride reagents. This fact induced a complete change in the regiochemistry in the reductions of α,β-unsaturated ketones 1 with Bu2SnH2–Bu2SnF2 (Reagent A): the use of Reagent A in combination with HMPA performed 1,2-reductions, while the addition of LiI to Reagent A achieved 1,4-reductions. It was demonstrated
我们发现,在氢化锡试剂中,Sn-F 和 Li-X(X = I,Br,Cl)之间有效地发生了卤素交换。这一事实导致 α,β-不饱和酮 1 用 Bu2SnH2–Bu2SnF2(试剂 A)还原的区域化学发生完全变化:试剂 A 与 HMPA 结合使用进行 1,2-还原,而添加 LiI试剂 A 实现了 1,4-还原。结果表明,有机锡氢化物的区域选择性很大程度上取决于与锡原子相连的卤素取代基的性质。
Di-n-butyltin halide hydrides
作者:Albert K. Sawyer、Yoyce E. Brown、Earl L. Hanson
DOI:10.1016/s0022-328x(00)83576-7
日期:1965.6
this method di-n-butyltin fluoride hydride, di-n-butyltin chloride hydride, di-n-butyltin bromide hydride, and di-n-butyltin iodide hydride were prepared. Infrared and protonmagneticresonance spectra were obtained showing characteristic Sn-H stretching frequencies in the infrared and characteristic chemical shifts in the magneticresonance spectra. Di-n-butyltin chloride hydride was shown to be formed
Synthesis of a Novel Ate Tin Hydride Complex Bearing a Nucleophilic Iodide Substituent and 1,4-Regioselective Reduction of α,β-Unsaturated Aldehydes
作者:Toshihiro Suwa、Ikuya Shibata、Akio Baba
DOI:10.1021/om990262d
日期:1999.9.1
A novelate tin hydride complex, Li+[n-Bu2SnI2H]- (I), was synthesized and characterized on the basis of its 119Sn NMR spectrum as a trigonal bipyramid (TBP) structure, in which two iodine atoms and one hydrogen atom occupy the apical and the equatorial positions, respectively. The apical iodine has much greater nucleophilicity than the hydrogen, so that the attack by iodide precedes the reduction
合成了一种新型的氢化锡络合物Li + [ n -Bu 2 SnI 2 H] -(I),并根据其119 Sn NMR光谱表征为具有两个碘原子的三角双锥体(TBP)结构。 1个氢原子分别占据顶部和赤道位置。顶端碘比氢具有更大的亲核性,因此碘的进攻先于氢的还原,实现了α,β-不饱和醛的区域选择性的1,4-还原。
Bu<sub>2</sub>SnIH-Promoted Proximal Bond Cleavage of Methylenecyclopropanes and Successive Radical Cyclization and/or Pd-Catalyzed Coupling Reaction
作者:Naoki Hayashi、Yusuke Hirokawa、Ikuya Shibata、Makoto Yasuda、Akio Baba
DOI:10.1021/ja7103729
日期:2008.3.1
The unprecedented regioselective hydrostannation of methylenecyclopropanes to give vinyltins was achieved using dibutyliodotin hydride (Bu2SnIH), which could be applied to intramolecular radical cyclization.