Alkylation and Ring Opening of Perfluoroalkyl- and Perfluoroaryl-Substituted 2-Siloxycyclopropanecarboxylates Yielding Fluorinated γ-Oxo Esters or β,γ-Unsaturated Ketones
作者:Hans-Ulrich Reissig、Daniel Gladow
DOI:10.1055/s-0033-1338892
日期:——
s and subsequent reaction with alkylhalides furnished C-1 alkylated cyclopropanes with high diastereoselectivities. Smooth triethylamine trishydrofluoride mediated desilylation and ring opening afforded the corresponding γ-oxo esters in good to excellent yields. Treatment of methyl 2-siloxycyclopropanecarboxylates with Grignardreagents and subsequent ring opening in the presence of acid provided
A reductiveamination/cyclization approach towards biologically interesting trifluoromethylated four- to seven-membered ring lactams from simply prepared ω-trifluoromethylketoesters in good to excellent yields has been developed. In addition, trifluoromethylatedδ-aminoalcohols were also obtained directly from an unexpected reduction of the corresponding y-imino esters in the presence of an excess
Hanack,M.; Meyer,H., Justus Liebigs Annalen der Chemie, 1968, vol. 720, p. 81 - 97
作者:Hanack,M.、Meyer,H.
DOI:——
日期:——
Concise synthesis of ω-fluoroalkylated ketoesters. A building block for the synthesis of six-, seven-, and eight-membered fluoroalkyl substituted 1,2-diaza-3-one heterocycles
were subsequently subjected as a fluorine-containing buildingblock to the synthesis of 1,2-diaza-3-one heterocycles has been optimized. Trifluoromethyl substituted seven- and eight-membered 1,2-diazapinone 8, 1,2-diazocinone 10 were also obtained via this sequential reaction of δ- (or ɛ-) trifluoromethyl ketoesters with hydrazine hydrates in acidic condition. In contrast, the sequential reaction of