使用多种含有二膦和手性[Ru(OAc)2(S)-BIHAP]的Rh(I)阳离子络合物,将一系列外消旋甲基α-[α-(甲氧基羰基氨基)烷基]丙烯酸酯(1a-e)氢化( BINAP = 2,2'-双(二苯基膦基)-1,1'-二萘基)作为催化剂前体,优先提供苏式异构体(2a-d),其非对映异构体选择性主要取决于1中的烷基。此外,发现Ru催化加氢过程中动力学拆分的相对速率比k R / k S在8-17范围内,随着烷基在1中的变化而随机变化。改变了。在一种特定情况下,讨论了通过底物控制的非对映选择性与由手性催化剂控制引起的(±)-1动力学区分之间的相互关系。
Chemoselectivity Control in the Reactions of 1,2-Cyclic Sulfamidates with Amines
作者:Lara Mata、Alberto Avenoza、Jesús H. Busto、Jesús M. Peregrina
DOI:10.1002/chem.201204392
日期:2013.5.17
Although 1,2‐cyclic sulfamidates derived from α‐methylisoserine undergo nucleophilicdisplacement at the quaternary center, to the best of our knowledge their behavior with amines as nucleophiles has never been explored. We have found that a broad range of amines can be used, demonstrating the scope of the reaction, and that excellent control of the chemoselectivity can be achieved. Application of