Totally diastereoselective synthesis of new P-chirogenic o-trimethylsiloxyaryl diazaphospholidines and o-hydroxyaryl diazaphospholidine–borane complexes
作者:Christian J Ngono、Thierry Constantieux、Gérard Buono
DOI:10.1016/s0022-328x(01)01314-6
日期:2002.2
The totally diastereoselective synthesis of several P(III)-chirogenic o-trimethylsiloxyaryl diazaphospholidines 4 was achieved by exchange reactions in refluxing toluene from the key intermediates, o-trimethylsiloxyaryl bis(dimethylamino) phosphines 2, and various chiral diamines 3. In the case of the use of a non-C2-symmetric chiral auxiliary such as (S)-2-anilinomethylpyrrolidine (3a), compounds
几种P(III)-致色的邻-三甲基甲硅烷氧基芳基二氮杂膦酸4的完全非对映选择性合成是通过在关键中间体,邻三甲基甲硅烷氧基芳基双(二甲氨基)膦2和各种手性二胺3回流甲苯中进行交换反应而实现的。如果使用非C 2对称的手性助剂,例如(S)-2-苯胺基甲基吡咯烷(3a),则可得到非立体异构纯形式的含有立体异构磷原子的化合物4a – g,作为热力学抗-非对映异构体。硼烷-二甲基硫醚使二氮杂膦烷4络合,然后甲氧基醚官能团进行甲醇水解,从而以71-86 %的高收率形成了所需的邻-羟基芳基二氮杂膦烷-硼烷络合物5。