hydroxylamine stage and cyclized to provide the novel chiral bicyclic hydroxamicacids (2,4,6). Michael addition of allyl acrylate on nitroacetic acid derivatives followed by Pd(0) catalyzed intramolecular allyl transfer and subsequent reduction of the nitro group yielded a novel class of cyclichydroxamicacids related to pyroglutamic acid.
Conjugate Addition versus Cycloaddition/Condensation of Nitro Compounds in Water: Selectivity, Acid-Base Catalysis, and Induction Period
作者:Luca Guideri、Francesco De Sarlo、Fabrizio Machetti
DOI:10.1002/chem.201202698
日期:2013.1.7
react in water as in chloroform with electron‐deficient dipolarophiles to give condensation or conjugate addition products under basecatalysis. In general, high selectivity towards condensation is observed in water, with shorter induction periods than in chloroform. In water, condensations slowly occur even without base; kinetic profiles evidence the catalytic effect of the base, which should be related
Synthesis of cyclic hydroxamic acids from aliphatic nitro compounds
作者:Achamma Thomas、Srinivasachari Rajappa
DOI:10.1016/0040-4020(95)00620-n
日期:1995.9
five membered α-substituted cyclichydroxamicacidsfrom aliphatic nitro compounds including nitro acetic acid derivatives is described. Michael addition of allyl acrylate to these compounds followed by Pd(0) catalyzed intra molecular allyl transfer and subsequent reduction of the tertiary nitro group results in a new class of compounds related to Nhydroxy pyroglutamic acid.