Abstract:
:Enantioselective approaches to synthesize six-membered oxacycles with multiple stereogenic centres are in high demand to enable the discovery of new therapeutic agents. Here we present a concise organocatalytic cycloetherification for the highly enantio- and diastereoselective synthesis of tetrahydropyrans involving simultaneous construction of two chiral centres, one of which is fully substituted. This method involves dynamic kinetic resolution of reversibly generated chiral cyanohydrins. A chiral bifunctional organocatalyst selectively recognizes a specific chair-like conformation of the intermediate, in which the small steric effect of the linear cyano group as well as its anomeric effect play important roles in controlling stereoselectivity. The products offer additional utility as synthetic intermediates because the cyano group can be further transformed into a variety of important functional groups. This strategy provides a platform to design efficient approaches to obtain a wide range of optically active tetrahydropyrans, which are otherwise synthetically challenging materials.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Yoneda N,Fujii Y,Matsumoto A,Asano K,Matsubara Sdoi
10.1038/s41467-017-01099-xsubject
Has Abstractpub_date
2017-11-09 00:00:00pages
1397issue
1issn
2041-1723pii
10.1038/s41467-017-01099-xjournal_volume
8pub_type
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