Pentanidium–Catalyzed Enantioselective α-Hydroxylation of Oxindoles Using Molecular Oxygen
摘要:
Pentanidium-catalyzed alpha-hydroxylation of 3-substituted-2-oxindoles using molecular oxygen has been developed with good yields and enantioselectivities. This reaction does not require an additional reductant such as triethyl phosphite, which was typically added to reduce the peroxide intermediate. The reaction was demonstrated to consist of two-steps: an enantioselective formation of hydroperoxide oxindole and a kinetic resolution of the hydroperoxicle oxindole via reduction with enolates generated from the oxindoles.
Scope, Limitations and Mechanistic Analysis of the HyperBTM‐Catalyzed Acylative Kinetic Resolution of Tertiary Heterocyclic Alcohols**
作者:Samuel M. Smith、Mark D. Greenhalgh、Taisiia Feoktistova、Daniel M. Walden、James E. Taylor、David B. Cordes、Alexandra M. Z. Slawin、Paul Ha‐Yeon Cheong、Andrew D. Smith
DOI:10.1002/ejoc.202101111
日期:2022.1.11
isothiourea HyperBTM catalyzes the acylative kinetic resolution of a wide range of tertiary heterocyclic alcohols under mild conditions with high selectivity. The synthetic utility of the methodology has been demonstrated with the preparation of two bioactive targets. Kinetic analysis reveals a fractional reaction order with respect to the alcohol concentration.
Pentanidium catalyzed enantioselective hydroperoxidation of 2-oxindole using molecular oxygen
作者:Shun Zhou、Lin Zhang、Chun Li、Yuanhu Mao、Jianta Wang、Ping Zhao、Lei Tang、Yuanyong Yang
DOI:10.1016/j.catcom.2016.04.016
日期:2016.7
Pentanidium catalyzed enantioselective 3-hydroperoxidation of 2-oxindoles with molecularoxygen has been established. Various 3-hydroperoxy-2-oxindoles were achieved in good ee and yield.