162750-07-4

Upstream product

• 70775-39-2 dimethylsulfoxonium methylide 
• 191280-97-4 N-(2,3:5,6-di-O-isopropylidene-α-D-mannofuranosyl)[2-hydroxy-4-(phenylmethoxy)phenyl]methanimine N-oxide 
• 52085-14-0 4-benzoxy-salicylaldehyde 

Downstream Products

• 320350-81-0 6-benzyloxy-benzofuran 

Relevant academic research and scientific papers

Asymmetric synthesis of N-substituted N-hydroxyureas

Asymmetric synthesis of (S)-N-(1-arylethyl)-N-hydroxyureas, (S)-N-(6-methoxy)- and (S)-N-(6-benzyloxy-2,3-dihydrobenzofuran-3-yl)-N-hydroxyurea- lipoxygenase inhibitor, is described. Three approaches to the formation of the N-hydroxyurea moiety at the stereogenic center have been used. The first one, via the reaction of (R)-6-benzyloxy-2,3-dihydrobenzofuran-3-ol with N,O-bis(phenoxycarbonyl)hydroxylamine under Mitsunobu conditions, leads to a partially racemized product. Alternatively, the enantioselective reduction of oximes O-benzyl ethers of acetophenone, 4-methoxy- and 4-benzyloxyacetophenone, 6-methoxy- and 6-benzyloxy-2,3-dihydrobenzofuran-3-one with borane/oxazaborolidines can be controlled to produce either the corresponding hydroxylamine O-benzyl ethers or primary amines which have been transformed into N-substituted N-hydroxyureas in 57% to 99% ee.

Enantioselective Synthesis of 5-LO Inhibitor Hydroxyureas. Tandem Nucleophilic Addition-Intramolecular Cyclization of Chiral Nitrones

An enantioselective synthesis of chiral hydroxyurea based 5-lipoxygenase inhibitors is reported via a five-step sequence in about 30% 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.

Synthesis of acid addition salts of hydroxylamines

This invention relates to novel diastereomeric acid addition salts of homochiral hydroxylamines, to processes for obtaining such, to processes for the conversion thereof to the corresponding homochiral hydroxylamines, to certain novel homochiral hydroxylamines and the processes for using these as intermediates.

Enantioselective synthesis of a 5-LO inhibiting hydroxyurea. Construction of the dihydro-benzofuran by tandem nucleophilic addition and intramolecular cyclization

An enantioselective synthesis of a 5-LO inhibiting chiral hydroxyurea is described based on the nucleophilic addition of dimethylsulfoxonium ylide to a nitrone bearing a mannose-derived chiral auxiliary. The dihydrobenzofuran skeleton is then constructed by a spontaneous cyclization of the initial adduct, thus completing a tandem nucleophilic addition-cyclization protocol.