High-yielding sequential one-pot synthesis of chiral and achiral α-substituted acrylates via a metal-free reductive coupling reaction
作者:Dhevalapally B. Ramachary、Chintalapudi Venkaiah、Y. Vijayendar Reddy
DOI:10.1039/c4ob00667d
日期:——
A general process for the high-yielding synthesis of substituted chiral and achiral α-substituted acrylates was achieved through the sequentialone-pot combination of a metal-free reductive coupling reaction followed by an Eschenmoser methylenation. The proline catalyzed reaction of Meldrum's acid, aldehydes and Hantzsch ester followed by methylenation was successful with Eschenmoser's salt in the
Diastereoselective Alkene Hydroesterification Enabling the Synthesis of Chiral Fused Bicyclic Lactones
作者:Zhanglin Shi、Chaoren Shen、Kaiwu Dong
DOI:10.1002/chem.202103318
日期:2021.12.23
alkenes afforded chiral γ-butyrolactones bearing two stereocenters. Employing the carbonylation products as key intermediates, the route from alkenes with single chiral center to chiral THF-fused bicyclic γ-lactones containing three stereocenters was developed.
Synthesis of optically active α-methylene γ-butyrolactones and (+)-mintlactone
作者:Geoffrey T. Crisp、Adam G. Meyer
DOI:10.1016/0040-4020(95)00236-2
日期:1995.5
combination of baker's yeast reductions of β-keto carbonyls, vinyl triflate formation and a palladium-catalysed, intramolecular, carbonylative coupling affords optically active α-methylene γ-butyrolactones. The synthesis of the unnatural (+)-mintlactone using this methodology is also described.
The stereoselective addition of enantiomerically pure (as shown by 200 MHz 1H NMR study) dipeptide Boc-Cys-Ala-OMe 4 to α-methylene-γ-butyrolactones has been studied. The stereoselectivity of the addition parallels the enantioselectivity observed in the allergic contact dermatitis induced in guinea pigs.
已经研究了对映体纯(如200 MHz 1 H NMR研究所示)向α-亚甲基-γ-丁内酯中立体定向加成的二肽Boc-Cys-Ala-OMe 4。添加的立体选择性与在豚鼠诱发的过敏性接触性皮炎中观察到的对映选择性平行。