Phase-Transfer-Catalyzed Enantioselective α-Hydroxylation of Acyclic and Cyclic Ketones with Oxygen
摘要:
An efficient and enantioselective alpha-hydroxylation of acyclic as well as cyclic ketones using molecular oxygen has been developed. This simple catalytic procedure uses a readily available phase transfer catalyst and produces a wide range of valuable tertiary a-hydroxy ketones in good to excellent enantiopurity.
Isothiourea‐Catalyzed Acylative Kinetic Resolution of Tertiary α‐Hydroxy Esters
作者:Shen Qu、Samuel M. Smith、Víctor Laina‐Martín、Rifahath M. Neyyappadath、Mark D. Greenhalgh、Andrew D. Smith
DOI:10.1002/anie.202004354
日期:2020.9.14
acylative kinetic resolution (KR) of acyclic tertiary alcohols has been developed. Selectivity factors of up to 200 were achieved for the KR of tertiary alcohols bearing an adjacent ester substituent, with both reaction conversion and enantioselectivity found to be sensitive to the steric and electronic environment at the stereogenic tertiarycarbinol centre. For more sterically congested alcohols