Synthesis of Enantiopure 1-Arylprop-2-en-1-ols and Their tert-Butyl Carbonates
摘要:
Enantiomerically pure 1-arylpropenols 8 have been prepared by resolution of the corresponding racemates, using the lipase formulation Novozyme 435. Deprotonation of the latter alcohols with n-BuLi, followed by derivatization with (t-BUO)(2)CO, afforded the corresponding carbonates 5. Optimization of the process is presented.
通过悬浮聚合制备含环氧基的磁性多孔聚合物微球(称为磁性Fe 3 O 4 @GEM微球)。Fe 3 O 4 @GEM的比表面积为30.41m 2 / g,平均孔径为17.13nm,孔体积为0.13cm 3 / g,表现出超顺磁性,饱和磁化强度为7.1emu / g。Fe 3 O 4 @GEM上的环氧基含量为0.22 mmol / g。假单胞菌属。脂酶(PSL)被共价固定在Fe 3 O 4上@GEM微球通过酶的氨基与微球上的环氧基之间的反应。与游离PSL相比,PSL / Fe 3 O 4 @GEM对烯丙基醇拆分为相应的旋光性(S)-烯丙醇和(R)-烯丙醇乙酸酯具有增强的对映选择性。当使用固定化PSL进行酯交换拆分(R)时,前者(S)-1-苯-2-丙-1-醇的对映体过量(98.1%)是后者(1.2%)的81.7倍。S)-l-苯-2-基-1-醇。此外,ee s和ee pPSL / Fe 3 O 4
Base-Free Dynamic Kinetic Resolution of Secondary Alcohols with a Ruthenium–Lipase Couple
作者:Inyeol Yun、Jin Yong Park、Jaiwook Park、Mahn-Joo Kim
DOI:10.1021/acs.joc.9b02510
日期:2019.12.20
dynamic kineticresolution (DKR) of various secondaryalcohols by the combination of a ruthenium catalyst and an anionic surfactant-activated lipoprotein lipase. The DKR reactions performed under totally base-free conditions at room temperature provided the products of excellent enantiopurities (91-99% ee or greater) in high yields (92-99%). More importantly, the DKR of α-arylallyl alcohols was achieved
Kinetic resolution of allylic alcohols via stereoselective acylation catalyzed by lipase PS-30
作者:Peiran Chen、Peng Xiang
DOI:10.1016/j.tetlet.2011.08.093
日期:2011.11
By using lipase PS-30 as catalyst, the kineticresolution of a series of racemic allylic alcohols has been achieved via stereoselective acylation. The value of kinetic enantiomeric ratio (E) reached up to 968. Substituent effect is briefly discussed.