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