An Enzymatic Enantioselective Route to Methyl Carboxylate 2,3 - Methanohomoserine γ-Lactone; A Precursor of Chiral 2,3 - Methanohomoserine
摘要:
Enzymatic hydrolysis of Dimethyl 2 - (tetrahydropyranyl) hydroxymethyl cyclopropane 1,1 - dicarboxylate 6 with an industrial esterase, followed by a deprotection of tetrahydropyranyl ether affords the title compound in 20% yield.
Molecular intelligence: The structurally novel lignan (+)‐linoxepin is synthesized in an eight‐step sequence. The enantioselective synthesis features the palladium‐catalyzed Catellanireaction as the key step. In this highly convergent multicomponent reaction, two new carbon–carbon bonds are formed, one of which results from a CH bond functionalization.
分子智能:结构新颖的木脂素 (+)-linoxepin 以八步序列合成。对映选择性合成以钯催化的 Catellani 反应为关键步骤。在这种高度收敛的多组分反应中,形成了两个新的碳-碳键,其中一个由 C H 键官能化产生。
Application of the Palladium-Catalysed Norbornene-Assisted Catellani Reaction Towards the Total Synthesis of (+)-Linoxepin and Isolinoxepin
the reliable and scalable synthesis of architecturally complex scaffolds. This report outlines the synthetic approachestowards this interesting class of biologically active molecules. After the key Catellani/Heckreaction, our synthesis features a Leimeux-Johnson oxidation and a titanium tetrachloride mediated aldol condensation. Finally, a tuneable Mizoroki-Heck reaction was performed to furnish not
A gold‐catalyzed asymmetriccyclopropanation of unactivated olefins with sulfoniumylides in the presence of a bimetallic catalyst with a novel dimeric TADDOL‐phosphoramidite ligand is reported. This transformation allows a rare gold‐catalyzed dynamic deracemization of chiral racemic substrates, where the same catalyst is responsible for several synergistic tasks in solution. The products are useful