Diastereoselective synthesis of α-(aminomethyl)-γ-butyrolactones via a catalyst-free aminolactonization
作者:P. Veeraraghavan Ramachandran、Daniel R. Nicponski
DOI:10.1039/c4cc05765a
日期:——
An auto-catalytic domino reaction involving an aza-Michael reaction, proton transfer, and lactonization furnishing α-aminomethyl-γ-butyrolactones in near quantitative yields and excellent diastereoselectivity is described.
4-(Dimethylamino)pyridine as a catalyst for the lactonization of 4-hydroxy-2-methylenebutanoate esters
作者:Daniel R. Nicponski
DOI:10.1016/j.tetlet.2014.02.024
日期:2014.3
The catalytic action of 4-(dimethylamino)pyridine (DMAP) in lactonizing 4-hydroxy-2-methylenebutanoate esters to 2-methylene-γ-butyrolactones is described. The use of DMAP, which functions as an excellent complement to the more traditional acid-catalyzed lactonization protocol, allows for the synthesis of 2-methylene-γ-butyrolactones containing acid-sensitive groups under essentially neutral conditions
β,γ-Diaryl α-methylene-γ-butyrolactones as potent antibacterials against methicillin-resistant Staphylococcus aureus
作者:Henry J. Hamann、Nader S. Abutaleb、Rusha Pal、Mohamed N. Seleem、P. Veeraraghavan Ramachandran
DOI:10.1016/j.bioorg.2020.104183
日期:2020.11
A selected series of racemic α-methylene-γ-butyrolactones (AMGBL) synthesized via allylboration or allylindation reactions were screened against methicillin-resistant Staphylococcus aureus (MRSA) USA300. Unlike natural AMGBLs, such as parthenolide, synthetic analogs bearing aryl moieties at the β- and γ-positions are potent against MRSA. The most potent molecules were comparable to vancomycin and linezolid
An efficient synthesis of α-methylene-γ-butyrolactones from Baylis–Hillman adducts via an In-mediated Barbier reaction and stereoselective lactonization under MeSO2Cl/Et3N conditions
作者:Bo Ram Park、Ko Hoon Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2010.10.077
日期:2010.12
An efficientsynthesis of trans-α-methylene-γ-butyrolactones is disclosed from syn-homoallylic alcohols via the intramolecular mesylate displacement reaction promoted by nearby ester group under the influence of MsCl/Et3N. syn-Homoallylic alcohols were prepared via the In-mediated Barbierreaction of the bromides of Baylis–Hillman adducts.
Baylis–Hillman chemistry: synthesis of cis- and trans-α-methylene-γ-lactones
作者:George W. Kabalka、Bollu Venkataiah、Chunlan Chen
DOI:10.1016/j.tetlet.2006.04.063
日期:2006.6
syn-Homoallylic alcohols prepared from Baylis–Hillman adducts react with CBr4/PPh3 to give trans-α-methylene-γ-lactones. Notably, the same alcohols yield the cis-α-methylene-γ-lactones in the presence of traces of p-toluenesulfonic acid.