Enantioselective Synthesis of 5-LO Inhibitor Hydroxyureas. Tandem Nucleophilic Addition−Intramolecular Cyclization of Chiral Nitrones
摘要:
An enantioselective synthesis of chiral hydroxyurea based 5-lipoxygenase inhibitors is reported via a five-step sequence in about 39% overall yield. The synthesis is based on a novel tandem nucleophilic addition-intramolecular cyclization reaction in which a chiral nitrone functions as the electrophilic acceptor species. A mannose-based chiral auxiliary controls the diastereoselectivity of the reaction in an 8:1 ratio. After the auxiliary removal and appropriate functionalization, a single recrystallization afforded the target structures in > 99% ee.
[EN] 5-LIPOXYGENASE INHIBITORS<br/>[FR] INHIBITEURS DE LA 5-LIPOXYGENASE
申请人:SMITHKLINE BEECHAM CORPORATION
公开号:WO1995002402A1
公开(公告)日:1995-01-26
(EN) Hydroxyurea compounds comprising fluorine substituted benzyloxy derivatives of dihydrobenzofuran and 4H-2,3-dihydrobenzopyran derivatives, pharmaceutical compositions thereof and their use as OPUFA and 5-lipoxygenase pathway inhibitors.(FR) Composés d'hydroxyurée comprenant des dérivés benzyloxylés de substitution par le fluor du dihydrobenzofurane et des dérivés de 4H-2,3-dihydroxybenzopyrane, compositions pharmaceutiques réalisées à partir de ces composés et utilisation de celles-ci comme inhibiteurs des voies des acides gras polyinsaturés oxygénés et de la 5-lipoxygénase.