A New Class of Chiral Organogermanes Derived from <i>C</i><sub>2</sub>-Symmetric Dithiols: Synthesis, Characterization and Stereoselective Free Radical Reactions
作者:Giovanna Gualtieri、Steven J. Geib、Dennis P. Curran
DOI:10.1021/jo026625s
日期:2003.6.1
A new class of dithiostannanes and dithiogermanes have been prepared from 1,1'-binaphthyl-2,2'-dithiol and 3,3'-bis(trimethylsilyl)-1,1'-binaphtho-2,2'-dithiol. While reduction of 4-butyl-4-chloro-3,5-dithia-4-stanna-cyclohepta[2,1-a;3,4-a']dinaphthalene to the corresponding tin hydride was unsuccessful, 4-tert-butyl-3,5-dithia-4-germa-cyclohepta[2,1-a;3,4-a']dinaphthalene and 4-tert-butyl-2,6-bis(trimethylsilyl)-3
由1,1'-联萘-2,2'-二硫醇和3,3'-双(三甲基甲硅烷基)-1,1'-联萘-2,2'-二硫醇制备了一类新的二硫代锡烷和二硫代锗烷。虽然将4-丁基-4-氯-3,5-二硫-4--4-锡烷-环庚[2,1-a; 3,4-a']二萘还原为相应的氢化锡未成功,但4-叔丁基-3,5-二硫代-4-germa-cyclohepta [2,1-a; 3,4-a']二萘和4-叔丁基-2,6-双(三甲基甲硅烷基)-3,5-二硫代-4 -germa-cyclohepta [2,1-a; 3,4-a'] d萘是通过分别用NaBH(4)和LiBH(4)还原母体氯化锗获得的。测定了两种氢化锗的氢转移至伯烷基的动力学常数。这些氢化锗还原α-卤代羰基化合物的ee值适中(最高42%),