Synthesis and inhibitory action on HMG-CoA synthase of racemic and optically active oxetan-2-ones (β-Lactones)
作者:Daniel Romo、Paul H.M. Harrison、Stephen I. Jenkins、R.William Riddoch、Kaapjoo Park、Hong Woon Yang、Cunxiang Zhao、Gerard D. Wright
DOI:10.1016/s0968-0896(98)00114-x
日期:1998.8
but variable enantioselectivity (22-85% ee). In in vitro assays using both native and recombinant HMG-CoA synthase from Saccharomyces cerevisiae, oxetan-2-ones mono-substituted at C4 with linear alkyl chains gave IC50s that decreased monotonically with chain length up to 10 carbons and then rose rapidly for longer chains. The transisomers of 3-methyl-4-alkyl-oxetan-2-ones showed a similar trend but had
Synthesis of β-Lactones by the Regioselective, Cobalt and Lewis Acid Catalyzed Carbonylation of Simple and Functionalized Epoxides
作者:Jong Tae Lee、P. J. Thomas、Howard Alper
DOI:10.1021/jo010295e
日期:2001.8.1
The PPNCo(CO)(4) and BF(3) x Et(2)O catalyzed carbonylation of simple and functionalized epoxides in DME gives the corresponding beta-lactones regioselectively in good to high yields. The carbonylation occurred selectively at the unsubstituted C-O bond of the epoxide ring, and this reaction tolerates various functional groups such as alkenyl, halide, hydroxy, and alkyl ether.
Carbonylative Ring Expansion of Epoxides to β‐Lactones Using Inorganic Salt as Catalytic Species Precursor
作者:L. He、J.‐C. Yang、T.‐T. Song、Y. Liu、X.‐B. Lu
DOI:10.1002/ejic.202200496
日期:2022.12.16
cobalt bromide was developed for carbonylative ring expansion of epoxides to β-lactone products in moderate to excellent yields. This work also represents a rare example of epoxide carbonylationunderatmospheric CO pressure.
开发了一种从廉价、空气稳定的溴化钴原位生成低价钴物种的策略,用于环氧化物羰基化扩环生成 β-内酯产品,收率中等至极佳。这项工作也代表了大气 CO2 压力下环氧化物羰基化的罕见例子。