Regioselectivity in ketyl radical promoted ring cleavage of configurationally restricted α,α-diketocyclopropanes under SET and PET conditions
作者:Bhim C. Maiti、Saswati Lahiri
DOI:10.1016/s0040-4020(98)00548-1
日期:1998.7
Regioselective bond scission of cyclopropyl ketones 1a-d in singleelectrontransfer (SET) reductive process with tributytin hydride has been found to be controlled by radical stabilizing effect. In the case of 1e and 11 stereoelectronic effect was also operative. Under photoinducedelectrontransfer (PET) condition similar regioselectivity was also observed. A ringexpansion product 16 via intramolecular ketone-cyclopropane
α-ketocyclopropane ring-opening reactions via o-stannyl ketyls
作者:E Enholm
DOI:10.1016/00404-0399(50)14046-
日期:1995.9.18
Synthesis of Linear and Angular Triquinane Skeletons by <i>O</i>-Stannyl Ketyl-Promoted Fragmentation−Cyclization Reactions of α-Keto Cyclopropanes
作者:Eric J. Enholm、Zhaozhong J. Jia
DOI:10.1021/jo961655e
日期:1997.1.1
alpha-ketocyclopropane via O-stannylketyls. A preference for cleavage of the cyclopropane bond with the best orbital overlap with the ketyl radical sp(2)-orbital even in the presence of radical stabilizing groups is indicated by these results. An O-stannylketyl ring scission-cyclization resulted in the novel synthesis of either a linear or an angulartriquinaneskeleton depending on the length and