Enantioselective Nickel‐Catalyzed Migratory Hydrocyanation of Nonconjugated Dienes
作者:Rongrong Yu、Shanmugam Rajasekar、Xianjie Fang
DOI:10.1002/anie.202008854
日期:2020.11.23
Metal‐catalyzed chain‐walking reactions have recently emerged as a powerful strategy to functionalize remote positions in organic molecules. However, a chain‐walking protocol for nonconjugated dienes remains scarcely reported, and developments are currently ongoing. In this Communication, a nickel‐catalyzed asymmetric hydrocyanation of nonconjugated dienes involving a chain‐walking process is demonstrated
formations between allyl carbonates and nontoxic allyl, allenyl, or propargyl boronates. This report represents the first use of these types of boronicesters in this particular context. The present transformations proceeded with high selectivity under remarkably mild conditions, and various functional groups including an aldehyde function proved to be compatible. In addition, several boronates were found
Mechanistic pathways in phosphate ester photochemistry
作者:Richard S. Givens、Rominder Singh
DOI:10.1016/0040-4039(91)85027-3
日期:1991.11
Initial bond breaking processes (homolysis vs heterolysis) of phosphateester photosolvolysis were probed by chemically trapping the reactive intermediates with a tethered 5-hexenyl group. The resulting mechanistic picture is a blend of homolytic and heterolytic pathways, where the heterolytic cleavage is dominant.