Retro Claisen cleavage of α-nitrocycloalkanones using trimethylsilylmethylmagnesium chloride (Peterson reagent): Synthesis of functionalized β-keto-trimethylsilanes.
Beta-ketosilanes, bearing a nitro functionality, can be prepared by nucleophilic ring cleavage of alpha-nitrocycloalkanones with the Peterson reagent. This high yielding process shows considerable chemoselectivity but fails with large rings (C(n)>7). This unusual reactivity is tentatively explained considering the silicon beta effect.
ROSINI, GOFFREDO;BALLINI, ROBERTO;MAROTTA, EMANUELA, TETRAHEDRON, 45,(1989) N8, C. 5935-5942
New and efficient synthesis of ω-nitroalcohols and spiroketals by chemio- and regioselective reductive cleavage of 2-nitrocycloalkanones
作者:Roberto Ballini、Marino Petrini、Goffredo Rosini
DOI:10.1016/s0040-4020(01)89065-7
日期:1990.1
ω-Nitroalcohols have been prepared by a new and efficient chemio- and regioselectivereductive cleavage performed on 2-nitrocycloketones with sodium borohydride in acetonitrile / water. This reaction opens a more practical and convenient route to the synthesis of spiroketals.