of group-VIII metal catalysts has been examined in the hydrogenation of nonconjugated enones at ambient temperature under an atmospheric pressure of hydrogen. A cobalt catalyst gave high yields of unsaturated alcohols from trialkylated olefinic ketones. Osmium showed the highest selectivity among platinum metal catalysts for the reduction of the carbonyl bond in the hydrogenation of trialkylated olefinic
A Convenient Synthesis of Some 1,4-Disubstituted 7-Oxabicyclo[2.2.1]heptanes
作者:S. R. Baker、J. R. Harris
DOI:10.1080/00397919108019807
日期:1991.10
Abstract An efficient synthesis of a 1,4-disubstituted 7-oxabicyclo[2.2.1]heptane intermediate and its subsequent conversion to a potential PAF antagonist is described.
An intramolecular Pauson-Khandreaction of various 3-alkynyl-1-alkylidenecyclic compounds was performed to give the corresponding [5.n.1.0 1 , 5 ] tricyclic compounds (n = 2-4). A facile construction of the core structure in cedrene terpenoids was also investigated in detail and formal total synthesis of α- and β-cedrenes was accomplished.
An expeditious and efficient formal totalsynthesis of antiviral and antitumor tetracyclic diterpene aphidicolin has been developed. An intramolecular Heck reaction (3→4) and an intramolecular Diels-Alder reaction (7→8) were utilized for the key step of the sequence.
Directed Evolution by Using Iterative Saturation Mutagenesis Based on Multiresidue Sites
作者:Loreto P. Parra、Rubén Agudo、Manfred T. Reetz
DOI:10.1002/cbic.201300486
日期:2013.11.25
More residues, less screening: Iterativesaturationmutagenesis (ISM) of the Baeyer–Villiger monooxygenase PAMO at two five‐residue sites leads to an active mutant in the diastereoselective Baeyer–Villiger reaction of 4‐(bromomethylidene)cyclohexanone.