Negishi cross-coupling reactions of α-amino acid-derived organozinc reagents and aromatic bromides
作者:Claire L. Oswald、Tomás Carrillo-Márquez、Lorenzo Caggiano、Richard F.W. Jackson
DOI:10.1016/j.tet.2007.11.031
日期:2008.1
Negishi cross-coupling reaction of organozinc iodides derived from α-amino acids with aromatic bromides to give substituted phenylalanine derivatives is described, using either Pd(OAc)2 or Pd2(dba)3 in combination with P(o-Tol)3 as catalyst in DMF at 50 °C. Similar results are obtained using Pd[PtBu3]2 as catalyst. The difference in reactivity displayed between aryl iodides and bromides (ArI>ArBr) has been
描述了将Pd(OAc)2或Pd 2(dba)3与P(o- Tol)3结合使用的方法,描述了α-氨基酸衍生的有机锌碘化物与芳族溴的Negishi交叉偶联反应,得到取代的苯丙氨酸衍生物。在50°C的DMF中作为催化剂。使用Pd [P t Bu 3 ] 2作为催化剂,可获得相似的结果。芳基碘化物和溴化物之间显示出的反应性差异(ArI> ArBr)已用于不对称,正交保护的对亚苯撑双丙氨酸衍生物的简短合成中。