专利号:US-6509506-B1 优先权日:1997-05-21 标 题 :Two step synthesis of D- and L- α-amino acids and D- and L- α-amino aldehydes 发明人:SHARPLESS K BARRY; LI GUIGEN 权利人:SCRIPPS RESEARCH INST 摘要:D- and L- α-amino acids and D- and L-α-amino aldehydes are synthesized from olefin substrates in two steps. The first step is a catalyzed asymmetric aminohydroxylation addition reaction to the olefin substrate. The addition reaction is catalyzed by osmium and is co-catalyzed by chiral ligands. The chiral ligands, in addition to being co-catalysts with the osmium, also serve to direct the addition reaction regioselectively and enantioselectively, divalent ligands are preferred over monovalent ligands because of their enhanced regio-and enantio-selectivity. As an oxidant nitrogen source for the addition reaction, either a carbamate or sulfonamide may be employed. If carbamate is employed as an oxidant nitrogen source, the resultant β-hydoxycarbamate is deprotected to yield the corresponding β-hydroxyamine. If sulfonamide is employed as an oxidant nitrogen source, the resultant β-hydroxysulfonamide is deprotected to yield the corresponding β-hydroxyamine. The resultant β-hydroxyamine is then selectively oxidized in a second synthetic step to produce the desired D- and L- α-amino acid or D- and L-α-amino aldehyde.
专利号:WO-2012152438-A1 优先权日:2011-05-11 标题 :Process for the preparation of nitrate acid ester of organic compounds 发明人:BONFANTI ANNALISA; STORONI LAURA; RONSIN GAEL 权利人:NICOX SA; BONFANTI ANNALISA; STORONI LAURA; RONSIN GAEL 摘要:The present invention relates to a one-step process for the synthesis of nitric acid esters or 15 N isotopically labeled nitrate esters of organic compounds starting from the correspondent alcohols. Formula (I).
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