Asymmetric Bioreduction of Alkenes Using Ene–Reductases YersER and KYE1 and Effects of Organic Solvents
作者:Yanto Yanto、Christoph K. Winkler、Stephanie Lohr、Mélanie Hall、Kurt Faber、Andreas S. Bommarius
DOI:10.1021/ol200394p
日期:2011.5.20
activated alkenes by KYE1 from Kluyveromyces lactis and Yers-ER from Yersinia bercovieri, two ene–reductasesfrom the OldYellowEnzymefamily, showed a broad substrate spectrum with a moderate to excellent degree of stereoselectivity. Both substrate- and enzyme-based stereocontrols were observed to furnish opposite stereoisomeric products. The effects of organic solvents on enzyme activity and stereoselectivity
Photoreactions of γ,δ-Unsaturated Chromium Carbene Complexes
作者:William H. Moser、Louis S. Hegedus
DOI:10.1021/ja9537585
日期:1996.1.1
A number of functionalized γ,δ-unsaturated chromiumcarbenecomplexes were synthesized, and their photochemistry was studied. Photolysis of carbenecomplexes 5 and 17 induced intramolecular [2 + 2] cycloaddition to afford cyclobutanones 6 and 18, respectively. If the photoreactions were not run in thoroughly degassed solvents, small amounts of lactones 7 and 19 were obtained as well. Cyclobutanones