1397644-49-3Relevant academic research and scientific papers
Scope, Limitations and Mechanistic Analysis of the HyperBTM-Catalyzed Acylative Kinetic Resolution of Tertiary Heterocyclic Alcohols**
Smith, Samuel M.,Greenhalgh, Mark D.,Feoktistova, Taisiia,Walden, Daniel M.,Taylor, James E.,Cordes, David B.,Slawin, Alexandra M. Z.,Cheong, Paul Ha-Yeon,Smith, Andrew D.
supporting information, (2021/11/16)
The full scope and limitations of the catalytic acylative kinetic resolution of a range of tertiary heterocyclic alcohols (78 examples, s up to >200) is reported under operationally-simple conditions, using low loadings of a commercially available Lewis basic isothiourea catalyst, HyperBTM (generally 1 mol %). The protocol is highly effective for the kinetic resolution of 3-substituted 3-hydroxyoxindole and α-substituted α-hydroxylactam derivatives bearing up to three potential recognition motifs at the stereogenic tertiary carbinol center. The full power of this methodology has been showcased through the synthesis of highly enantioenriched biologically-active target compounds in both enantiomeric forms. To provide further insight into the reaction mechanism, a detailed kinetic analysis of this Lewis base-catalyzed acylation of tertiary alcohols is reported using the variable time normalization analysis (VTNA) method.
Pentanidium catalyzed enantioselective hydroperoxidation of 2-oxindole using molecular oxygen
Zhou, Shun,Zhang, Lin,Li, Chun,Mao, Yuanhu,Wang, Jianta,Zhao, Ping,Tang, Lei,Yang, Yuanyong
, p. 29 - 31 (2016/05/11)
Pentanidium catalyzed enantioselective 3-hydroperoxidation of 2-oxindoles with molecular oxygen has been established. Various 3-hydroperoxy-2-oxindoles were achieved in good ee and yield.
Pentanidium-catalyzed enantioselective α-hydroxylation of oxindoles using molecular oxygen
Yang, Yuanyong,Moinodeen, Farhana,Chin, Willy,Ma, Ting,Jiang, Zhiyong,Tan, Choon-Hong
supporting information, p. 4762 - 4765 (2013/01/15)
Pentanidium-catalyzed α-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 hydroperoxide oxindole via reduction with enolates generated from the oxindoles.
