Synthesis of spirosystems by rhodium(II)-carbenoid CH insertion reactions
作者:Pompiliu S. Aburel、Kjell Undheim
DOI:10.1016/s0040-4039(98)00591-7
日期:1998.5
preparation of spiro[4,4]nonane-2,7-dione derivatives from open chain bis(α-diazoketones). The reactions proceed by an intramolecular Rh(II)-carbenoid insertion into a methylene CH bond yielding a cyclopentane which subsequently undergoes CH methine insertion and cyclopentyl spiroannulation.
Rhodium(II)-carbenoid C–H insertion reactions in the synthesis of β-oxospirane systems
作者:Pompiliu S. Aburel、Kjell Undheim
DOI:10.1039/b001988g
日期:——
A simple one-pot procedure is described for the preparation of spiro[4.4]nonane-2,7-dione derivatives from open chain bis(α-diazoketones) by two consecutive intramolecular Rh(II)-catalyzed carbenoid insertion reactions. With 1-diazo-4-(3-oxocycloalkyl)butan-2-ones as substrates, the methodology provides 2,7-dioxospiranes with a cyclopentane ring spiroannulated onto a five-, six- or seven-membered cycloalkane.