Ruthenium- and lipase-catalyzed inversion of l-lactates
摘要:
The ruthenium catalyzed inversion of L-lactic acid esters in the presence of Novozym 435 is described which give D-lactates in good yields and with >99% ee. (C) 2012 Elsevier Ltd. All rights reserved.
Highly Enantioselective Acylation of <i>rac</i>-Alkyl Lactates Using <i>Candida antarctica</i> Lipase B
作者:Yeon Soo Lee、Joo Hee Hong、Nan Young Jeon、Keehoon Won、Bum Tae Kim
DOI:10.1021/op0498722
日期:2004.11.1
cases, only alkyl (R)-lactate was stereoselectively acylated at >99.5% ee. The lipase-catalyzed acylation rate of the alkyl lactates was affected by the nature of the organicsolvents, but showed no correlation to log P of the solvent. The lipase-catalyzed acylation rate of the alkyl lactates was enhanced by increasing the chain length of the vinyl alkanoate from acetyl to butanoyl and by raising the
通过在温和条件下使用南极假丝酵母脂肪酶 B,已经完成了来自外消旋混合物的 (R)-乳酸烷基酯与链烷酸乙烯酯的高度对映选择性酰化。本研究考察了有机溶剂、乳酸烷基酯和链烷酸乙烯酯的烷基链长度、反应温度对对映体过量以及反应速率的影响。在所有情况下,只有 (R)-乳酸烷基酯在 >99.5% ee 时被立体选择性酰化。乳酸烷基酯的脂肪酶催化酰化速率受有机溶剂性质的影响,但与溶剂的 log P 无关。通过增加链烷酸乙烯酯从乙酰基到丁酰基的链长以及将反应温度提高到 65 °C,可以提高乳酸烷基酯的脂肪酶催化的酰化速率。
METHODS AND COMPOSITIONS FOR PREVENTING OPIOID ABUSE
申请人:Thottathil John K.
公开号:US20170151232A1
公开(公告)日:2017-06-01
Abuse-resistant opioid compounds, drug delivery systems, pharmaceutical compositions comprising an opioid covalently bound to a chemical moiety are provided. Methods of delivering an active ingredient to a subject and methods of preventing opioid abuse are also provided.