Brønsted Acid‐Catalyzed Enantioselective Iodocycloetherification Enabled by Triphenylphosphine Selenide Cocatalysis
作者:Sudip Guria、Constantin G. Daniliuc、Ulrich Hennecke
DOI:10.1002/adsc.202100605
日期:2021.8.3
Enantioselective iodocycloetherifications can be conducted using sterically highly demanding BINOL-based phosphoric acid diesters as catalyst. To achieve highly enantioselective reactions, cocatalysis by triphenylphosphine selenide is necessary. With cocatalysis, good to excellent enantioselectivities can be achieved for a broad range of substrates using catalyst and cocatalyst loadings as low as 1 mol %
对映选择性碘环醚化可以使用空间上要求很高的基于 BINOL 的磷酸二酯作为催化剂进行。为了实现高度对映选择性反应,需要通过硒化三苯基膦进行共催化。通过助催化,使用低至 1 mol % 的催化剂和助催化剂负载量,可以为广泛的底物实现良好到出色的对映选择性。三苯基膦硒化物助催化剂本身不会强烈影响非对映选择性,但会导致更高的反应性,并与基于 BINOL 的磷酸二酯结合使用,可实现良好的对映选择性。