Enantioselective Benzylation and Allylation of α-Trifluoromethoxy Indanones under Phase-Transfer Catalysis
作者:Yumeng Liang、Mayaka Maeno、Zhengyu Zhao、Norio Shibata
DOI:10.3390/molecules24152774
日期:——
The organo-catalyzed enantioselective benzylation reaction of α-trifluoromethoxy indanones afforded α-benzyl-α-trifluoromethoxy indanones with a tetrasubstituted stereogenic carbon center in excellent yield with moderate enantioselectivity (up to 57% ee). Cinchona alkaloid-based chiral phase transfer catalysts were found to be effective for this transformation, and both enantiomers of α-benzyl-α-trifluoromethoxy
α-三氟甲氧基茚满酮的有机催化对映选择性苄基化反应以优异的收率和中等对映选择性(高达 57% ee)得到了具有四取代立体碳中心的 α-苄基-α-三氟甲氧基茚满酮。发现基于金鸡纳生物碱的手性相转移催化剂对这种转化有效,并且获得了 α-苄基-α-三氟甲氧基茚满酮的两种对映异构体,这取决于辛可尼丁和辛可宁衍生催化剂的使用。该方法扩展到α-三氟甲氧基茚满酮的对映选择性烯丙基化反应,以中等收率和良好的对映选择性(高达76%ee)得到烯丙基化产物。