Synthetic approaches to either homochiral or achiral derivatives of 3-hydroxy-2(5H)-furanone (isotetronic acid)
作者:Joaquim Bigorra、Josep Font、Cristina Ochoa de Echagüen、Rosa M. Ortuño
DOI:10.1016/s0040-4020(01)81841-x
日期:1993.7
Several title compounds were synthesized according to new methods based either on the use of D-ribonolactone as a chiral precursor or on the cyclization of 2,4-dioxopentanoic acid as a suitable achiral precursor. Base-induced elimination and subsequent acid-promoted ring contraction is an efficient protocol for the preparation of isotetronic acids from 2-O-alkyl-3,4-O-benzylidene-D-ribono-1,5-lactone derivatives
cycloadditions of dienes to some 5-ylidene-2(5)-furanones have been examined from experimental and theoretical points of view. The role that different substituents play on directing the observed site-selectivity (endocyclic or exocyclic doublebond at the dienophile counterpart) is discussed. Several new potential synthetic building blocks have been prepared in good yields.