Potential Anticancer Agents.1 XLII. Tetrahydroquinazoline Analogs of Tetrahydrofolic Acid. III. An Improved Synthesis of 5,8-Dideaza-5,6,7,8-tetrahydrofolic Acid
Improvement of a Stereoselective Biocatalytic Synthesis by Substrate and Enzyme Engineering: 2-Hydroxy-(4′-oxocyclohexyl)acetonitrile as the Model
作者:Manuela Avi、Romana M. Wiedner、Herfried Griengl、Helmut Schwab
DOI:10.1002/chem.200800609
日期:——
regard to substrate range, reaction scope, and insufficient selectivity with unnatural compounds. These shortcomings can be challenged by enzyme and/or substrate engineering, which are employed to alter substrate specificity and enhance the enzyme selectivity toward unnatural substrates. Herein, these two approaches are coupled to improve the hydroxynitrilelyasecatalyzed synthesis of 2-hydroxy-(4
Ultrasonically accelerated cycloaddition - rearrangement of enol ethers
作者:David Goldsmith、José J. Soria
DOI:10.1016/s0040-4039(00)74352-8
日期:1991.11
Cycloaddition-rearrangement reactions of methyl cyclohexenyl ethers with p-bromobenzenesulfonyl azide in neat homogeneous admixture are substanially accelerated by low-wattage ultrasound. Using ultrasound approximately the same yields of rearranged products are obtained in less time at lower temperature than observed at ambient sonic frequencies and elevated temperature. A previously unreported product structural type has also been found.
Petrow, Zhurnal Obshchei Khimii, 1941, vol. 11, p. 663
作者:Petrow
DOI:——
日期:——
Fiesselmann, Chemische Berichte, 1942, vol. 75, p. 881,889