Lactonization of epoxyendic anhydride in reactions with amines
摘要:
Reactions of exo-5,6-epoxybicyclo[2.2.1]hept-5-ene-endo-2,endo-3-dicarboxylic anhydride (epoxyendic anhydride) with acyclic, aromatic, heteroaromatic, and nonaromatic heterocyclic amines afforded the corresponding heterocyclization products, substituted exo-2-hydroxy-5-oxo-4-oxatricyclo[4.2. 1.0(3,7)]nonaneendo-9-carboxamides (oxabrendanes), whose structure was confirmed by the IR and H-1 and C-13 NMR (including two-dimensional) spectra. Other approaches to the tricyclic compounds were also examined, in particular via reactions of organic peroxy acids with amido acids obtained by aminolysis of endic anhydride.
Catalytic asymmetric synthesis of highly functionalised compounds with six contiguous stereocentres
作者:R. Alan Aitken、Jayalakshmi Gopal、Jennifer A. Hirst
DOI:10.1039/c39880000632
日期:——
Alcoholysis of the achiral epoxyanhydride (1) in the presence of a catalytic quantity of a cinchona alkaloid gives, in a single step, the chiral products (2) in up to 99% enantiomeric excess.