Immobilization of an acid–base cooperative catalyst on MCM-41 as a heterogeneous approach for the asymmetric cyanoethoxycarbonylation of isatins
作者:Amamudin Ansari、Parth Patel、Gaurav Kumar、Noor-ul H. Khan
DOI:10.1039/c9nj02515d
日期:——
Heterogenization of chiral quinine-thiourea catalyst for enantioselective cyanation reaction. The catalyst is found to be efficient and recyclable up to five times with retention of its catalytic activity.
Teaming up to make it happen: In the title reaction, the Lewis basic site of the catalyst activated ethyl cyanoformate, and the deep and flexible Brønsted acidic cavity stabilized and selectively recognized the key reaction intermediate to promote asymmetric acylation (see scheme).