An alternate synthesis of enantiomerically pure levetiracetam (Keppra®)
摘要:
A simple and efficient synthesis of levetiracetam has been achieved with high enantiopurity (>99%) starting from commercially available benzyl glycidyl ether. The method is amenable for industrial scale-up. (C) 2012 Elsevier Ltd. All rights reserved.
The invention relates to novel resolvin compounds and pharmaceutical preparations thereof. The invention further relates to methods of treatment using the novel resolvin compounds of the invention.
Ring closing metathesis for the formation of medium ring ethers: the total synthesis of (−)-isolaurallene
作者:Michael T Crimmins、Kyle A Emmitte、Allison L Choy
DOI:10.1016/s0040-4020(02)00040-6
日期:2002.3
The total synthesis of the marine metabolite (−)-isolaurallene is described. Two approaches to the core nine-membered ether are presented both of which are based on a ring closing metathesis to close the cyclic ether.
An object of the present invention is to provide a compound represented by formula (I) which is highly specific to tau and can image tau with satisfactory sensitivity, and also has high brain transition, low or non-recognized bone-seeking properties and low or undetected toxicity.
(+)-Homononactic acid, one of the monomers of polynactin, and its 8-epimer were synthesized. The key step was cis-selective iodoetherification of the enone or the α-silyloxyolefin intermediates constructed with Wittig-Horner or Julia coupling reactions, respectively.
based on Cram chelation control. Ring-closing metathesis, as the key reaction, was carried out to combine the segments for the synthesis of methynolide and 10-epi-methynolide. The total synthesis of methymycin was also achieved by the glycosylation of methynolide with the trichloroimidate derivative of D-desosamine.