High-Pressure Accelerated Asymmetric Organocatalytic Friedel–Crafts Alkylation of Indoles with Enones: Application to Quaternary Stereogenic Centers Construction
organocatalytic Friedel–Craftsalkylation of indoles with α,β-unsaturated ketones was found to be efficiently accelerated under high-pressure conditions with a low loading of chiral primary amine salts with good yield and enantioselectivity up to 90%. This approach also allows, for the first time, selected indole derivatives containing quaternary stereogenic centers to be obtained from prochiral β,β-disubstituted
Highly Enantioselective Transfer Hydrogenation of α,β-Unsaturated Ketones
作者:Nolwenn J. A. Martin、Benjamin List
DOI:10.1021/ja065708d
日期:2006.10.1
We describe an efficient and highlyenantioselective conjugate transfer hydrogenation of α,β-unsaturatedketones that is catalyzed by a salt made from tert-butyl valinate and a recently introduced powerful chiral phosphoric acid catalyst (TRIP).
Model Studies on Peroxidic Glutathione Transferase (GST) Inhibitors: C5-Methylated 1,2,4-Trioxanes with C6-Acrylate Side Chains
作者:Axel G. Griesbeck、Andreas Maaßen、Maria Bräutigam、Markus Pietsch
DOI:10.1002/ejoc.201500326
日期:2015.7
obtained by indium(III)-catalyzed condensation of an orthoester with the hydroperoxide 7. The new compounds 8 and 9 exhibited moderate inhibition of human placental glutathionetransferase (GST), comparable to that shown by the 5-unsubstituted model trioxane 11.
Continuous-flow synthesis of polysubstituted γ-butyrolactones via enzymatic cascade catalysis
作者:Liliang Chu、Xiaoyan Zhang、Jianing Li、Xuelei Deng、Miao Wu、Ya Cheng、Weiping Zhu、Xuhong Qian、Yunpeng Bai
DOI:10.1016/j.cclet.2023.108896
日期:2024.4
Polysubstituted chiral -butyrolactones are the core structural units of many natural products and high value-added flavors and fragrances used in the food and cosmetic industry. Current enzymatic cascade synthesis of these molecules faces the problems of low enzyme activity and phase separation in batch reaction, resulting in low productivity. Herein, we report a new continuous-flow process to synthesize the
Chemoenzymatic One-Pot Synthesis of γ-Butyrolactones
作者:Margarete Korpak、Jörg Pietruszka
DOI:10.1002/adsc.201100110
日期:2011.6
AbstractThe synthesis of enantio‐ and diastereomerically pure γ‐butyrolactones is described using a one‐pot, two‐enzyme cascade. Ethyl 2‐methyl‐4‐oxopent‐2‐enoate (2) was reduced selectively first in a 1,4‐reduction using the old yellow enzyme (OYE1) [EC 1.6.99.1] and consecutively in a 1,2‐reduction by an alcohol dehydrogenase [EC 1.1.1.2].