The use of carbon dioxide to functionalize saccharides as natural products especially for obtaining organocatalysts or cryptands

Synthesis of Cross-Chain Bridging Cryptands and Induction of Molecular Chirality

“…Chiral cryptands have been synthesized for the chiral discrimination of organic compounds, and easily available chiral synthons possessing chiral carbon centers have been used as parts of components for the synthesis of the chiral analogues of original cryptands. − The construction of chiral centers during synthetic processes is another approach to the synthesis of chiral analogues. , An alternative strategy for the synthesis of chiral cryptand analogues is the induction of molecular chirality. For example, Collet and Lehn et al synthesized a potentially chiral speleand consisting of an azacrown ether and a C 3 -symmetric cyclotriveratrylene unit .…”