Diastereomeric Discrimination in the Lifetimes of Norrish Type II Triplet 1,4-Biradicals and Stereocontrolled Partitioning of Their Reactivity (Yang Cyclization versus Type II Fragmentation)
作者:Jarugu Narasimha Moorthy、Apurba L. Koner、Subhas Samanta、Nidhi Singhal、Werner M. Nau、Richard G. Weiss
DOI:10.1002/chem.200600880
日期:2006.11.24
The stereochemistry at C2 and C3 carbons controls the partitioning of triplet 1,4-biradicals of ketones 2 among various pathways. Differences in the major reaction pathways, for example, cyclization (syn) and fragmentation (anti), adopted by the diastereomeric 1,4-radicals of ketones 2 have permitted unprecedented diastereomeric discrimination in their lifetimes to be observed by nanosecond laser flash
Enantioselective platforms to facilitate prenylation are potentially expansive for translational research due to the importance of this motif as a key regulatory of biological function. Motivated by the conspicuous dearth of methods to generate chiral prenyl fragments for contemporary drug discovery, a light-enabled deconjugative isomerization of activated alkenes containing an aryl ketone antenna