Broad Scope Synthesis of Ester Precursors of Nonfunctionalized Chiral Alcohols Based on the Asymmetric Hydrogenation of α,β-Dialkyl-, α,β-Diaryl-, and α-Alkyl-β-aryl-vinyl Esters
作者:Félix León、Pedro J. González-Liste、Sergio E. García-Garrido、Inmaculada Arribas、Miguel Rubio、Victorio Cadierno、Antonio Pizzano
DOI:10.1021/acs.joc.7b00710
日期:2017.6.2
a high enantioselectivity in the hydrogenation of E/Z mixtures (ca. Z/E = 75:25) of α,β-dialkylvinyl substrates, while a dramatic decrease on enantioselectivity was observed in the case of α-methyl-β-anisylvinyl acetate (Z/E = 58:42). Complementary deuteration reactions are in accord with a highlyenantioselectivehydrogenation for both olefin isomers in the case of α,β-dialkylvinyl esters. In contrast
Highly Enantioselective Dynamic Kinetic Resolution of 1,2−Diarylethanols by a Lipase−Ruthenium Couple
作者:Mahn-Joo Kim、Yoon Kyung Choi、Sol Kim、Daeho Kim、Kiwon Han、Soo-Byung Ko、Jaiwook Park
DOI:10.1021/ol800163z
日期:2008.3.1
A practical procedure has been developed for the dynamickineticresolution of 1,2-diarylethanols. This procedure employs a highly enantioselective lipase from Pseudomonas stutzeri (trade name, lipase TL) as the resolutioncatalyst and a rutheniumcomplex as the racemizationcatalyst. Sixteen 1,2-diarylethanols have been efficiently resolved to provide their acetyl derivatives with good yields (95-97%)