Effect of Additives on Chemoselectivity and Diastereoselectivity in the Catalytic Epoxidation of Chiral Allylic Alcohols with Hydrogen Peroxide and Binuclear Manganese Complexes
作者:Hamdullah Kilic、Waldemar Adam、Paul L. Alsters
DOI:10.1021/jo801974e
日期:2009.2.6
chiral allylic alcohols 2 by manganese complexes of the cyclic triamine 1,4,7-trimethyl-1,4,7-triazacyclononane (tmtacn) 1 and hydrogen peroxide as oxygen donor in the presence of co-catalyst are investigated to understand the factors that affect the catalyst selectivity. Chemoselectivity and diastereoselectivity of catalyst 1 are significantly affected by the structure of the allylic alcohol and the
研究了在助催化剂存在下,环状三胺1,4,7-三甲基-1,4,7-三氮杂环壬烷(tmtacn)1和过氧化氢作为氧供体的锰配合物对手性烯丙基醇2的催化氧化,了解影响催化剂选择性的因素。烯丙醇的结构以及助催化剂的性质和量显着影响催化剂1的化学选择性和非对映选择性。H 2 O 2的添加摩尔当量(相对于基材为20-110 mol%)的影响更为明显。我们目前的结果反映了Mn催化剂1 / H 2的复杂氧化还原化学反应O 2 /助催化剂体系在烯烃氧化的早期阶段。