Synthesis and Functionalization
of Cyclic Sulfonimidamides:
A Novel Chiral Heterocyclic Carboxylic Acid Bioisostere
- Publication date
- 2012
- Publisher
Abstract
An efficient synthesis of aryl substituted cyclic sulfonimidamides
designed as chiral nonplanar heterocyclic carboxylic acid bioisosteres
is described. The cyclic sulfonimidamide ring system could be prepared
in two steps from a trifluoroacetyl protected sulfinamide and methyl
ester protected amino acids. By varying the amino acid, a range of
different C-3 substituted sulfonimidamides could be prepared. The
compounds could be further derivatized in the aryl ring using standard
cross-coupling reactions to yield highly substituted cyclic sulfonimidamides
in excellent yields. The physicochemical properties of the final compounds
were examined and compared to those of the corresponding carboxylic
acid and tetrazole derivatives. The unique nonplanar shape in combination
with the relatively strong acidity (p<i>K</i><sub>a</sub> 5–6) and the ease of modifying the chemical structure to
fine-tune the physicochemical properties suggest that this heterocycle
can be a valuable addition to the range of available carboxylic acid
isosteres