Organic reactions in frozen water: Michael addition of amines and thiols to the dehydroalanine side chain of nocathiacins
作者:B.Narasimhulu Naidu、Wenying Li、Margaret E. Sorenson、Timothy P. Connolly、John A. Wichtowski、Yunhui Zhang、Oak K. Kim、John D. Matiskella、Kin S. Lam、Joanne J. Bronson、Yasutsugu Ueda
DOI:10.1016/j.tetlet.2003.11.081
日期:2004.1
In order to overcome this problem, we developed unique conditions in which Michael addition of amine and thiol nucleophiles to the dehydroalanine moiety of nocathiacins was successfully achieved in frozen water. Under these conditions, the Michael addition was highly chemoselective, very efficient and provided good isolated yields of the desired products.
Nocathiacins是密集功能化的环状噻唑基肽天然产物,对多种革兰氏阳性细菌(包括多种多重耐药菌株)具有强大的体外和体内抗菌活性。尝试在已知条件下制备迈克尔加合物导致形成复杂的产物混合物。为了克服这个问题,我们开发了独特的条件,其中在冷冻水中成功地实现了将胺和巯基亲核试剂的迈克尔加成到Nocathiacins的脱氢丙氨酸部分中。在这些条件下,迈克尔加成物具有高度的化学选择性,非常有效,并提供了所需产物的良好分离产率。