Total synthesis of (+)-valienamine and (−)-1-epi-valienamine via a highly diastereoselective allylic amination of cyclic polybenzyl ether using chlorosulfonyl isocyanate
作者:Qing Ri Li、Seung In Kim、Sook Jin Park、Hye Ran Yang、A Reum Baek、In Su Kim、Young Hoon Jung
DOI:10.1016/j.tet.2013.09.098
日期:2013.12
The total synthesis of (+)-valienamine and (−)-1-epi-valienamine was concisely accomplished from readily available d-glucose via a highlydiastereoselectiveamination of chiral benzylic ether usingchlorosulfonylisocyanate, intramolecular olefin metathesis, and diastereoselective reduction of cyclic enone using l-Selectride as the key steps.
Two synthetic routes to a carbocyclic precursor to valienamine are reported, startingfrom either D-glucose or L-sorbose and using ring-closing metathesis as a key step. A low-yielding synthesis of 1-epi-valienamine is reported. Results from an abortive third possible route to valienamine based on an early introduction of nitrogen are discussed.