Synthesis of Multisubstituted 1,4-Dihydrobenzoxazin-2-ones through a One-Pot Nucleophilic N-Alkylation/C-Alkylation of Cyclic α-Imino Esters
作者:Lode De Munck、Carlos Vila、Carolina Pons、José Pedro
DOI:10.1055/s-0036-1588742
日期:2017.6
via a one-pot N-alkylation/C-alkylation reactions is reported. A nucleophilic N-alkylation of 2-oxobenzoxazine-2-carboxylates with organozinc reagents with good selectivities and in moderate to good yields is described. Moreover, the synthesis of multisubstituted 1,4-dihydrobenzoxazine-2-ones bearing a tetrasubstituted carbon atom via a one-pot N-alkylation/C-alkylation reactions is reported.
(Methyl Difluoroacetate)copper Reagent. Remarkable Solvent Effect on the<sup>19</sup>F-NMR Spectrum, Stability and Reactivity
作者:Osamu Kitagawa、Takeo Taguchi、Yoshiro Kobayashi
DOI:10.1246/cl.1989.389
日期:1989.3
The 19F-NMR spectrum, thermal stability and reactivity of (methyl difluoroacetate)copper reagent were found to differ remarkably depending on the solvent (DMSO, DMF, or HMPA) used. With allylic bromide or alkynyl halide a crucial solvent effect for the coupling reactions was observed.