Efficient Enantioselective Reduction of Ketones with <i>Daucus carota</i> Root
作者:J. S. Yadav、S. Nanda、P. Thirupathi Reddy、A. Bhaskar Rao
DOI:10.1021/jo010399p
日期:2002.5.1
active alcohols are the potential chiral building blocks for the synthesis of pharmaceutically important molecules and asymmetricchiral ligands. Hence, this biocatalytic approach is found to be the most suitable for the preparation of a wide range of chiralalcohols and gave inspiration for the development of a new biotechnological process.
A improved process for preparing 4-hydroxy-2-pyrrolidone of the formula ##STR1## which is characterized in reacting a 4-halogeno-3-hydroxybutyrate and an alkali metal or alkaline earth metal azide, to produce a 4-azido-3-hydroxybutyrate and hydrogenating an azide group of the ester compound and then cyclizing a hydrogenated compound. 4-Hydroxy-2-pyrrolidone is useful for an intermediate of medicines and agricultural chemicals.
Study of Class I and Class III Polyhydroxyalkanoate (PHA) Synthases with Substrates Containing a Modified Side Chain
作者:Kaimin Jia、Ruikai Cao、Duy H. Hua、Ping Li
DOI:10.1021/acs.biomac.6b00082
日期:2016.4.11
class III synthase from Allochromatium vinosum (PhaECAv). It was found that, while different PHA synthases displayed distinct preference with regard to the length of the alkyl sidechains, they could withstand moderate sidechain modifications such as terminal unsaturated bonds and the azide group. Specifically, the specific activity of PhaCCs toward propynyl analogue (HHxyCoA) was only 5-fold less than
Several trials were made for the syntheses of (S)-4-hydroxy-pyrrolidin-2-one ((S)-HPD) and (R)-4-mercapto-pyrrolidin-2-one ((R)-MPD), a substituent at the 2-position of the orally active carbapenem antibiotic CS-834. The latter was synthesized from prochiral dimethyl or diethyl 3-p-methoxybenzylthioglutarate using pig liver esterase technology to give monoester with an optical purity of 51-71% e.e. as a key intermediate.