Enantioselective Organocatalytic Amine-Isocyanate Capture-Cyclization: Regioselective Alkene Iodoamination for the Synthesis of Chiral Cyclic Ureas
作者:Thomas J. Struble、Hannah M. Lankswert、Maren Pink、Jeffrey N. Johnston
DOI:10.1021/acscatal.8b03708
日期:2018.12.7
chiral diamines are prominent features of therapeutics, chiral auxiliaries, and intermediates in complex molecule synthesis. Although many methods for diamine synthesis are available, metal-free enantioselective alkene functionalizations to make protected 1,2- and 1,3-diamines from simple achiral starting materials are rare, and a single reagent that accesses a cross-section of each congener with high enantiomeric
手性二胺尿素是复杂分子合成中治疗剂,手性助剂和中间体的突出特征。尽管有许多二胺合成方法可用,但很少有无金属的对映选择性烯烃官能化反应,可从简单的非手性起始原料制备受保护的1,2-和1,3-二胺,并且只有一种试剂可以通过高对映体过量不可用。我们描述以合成对映体富集方法从烯丙基胺和用一种异氰酸酯的环状5-和6-元脲c ^ 2 -对称的双(脒)(BAM)催化剂,可提供Ñ的磺酰酰亚胺中间体具有良好的选择性,克服了氮的电子和空间失活。的1,2-二取代的烯烃的几何形状相关联于5-外型和6-内的环化反应,而不改变烯烃面选择性,这是出乎意料的相反观察Ö -nucleophiles。NK 1拮抗剂的合成突出了对二胺和咪唑啉酮衍生物的直接产物操作。