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    • 2. 发明授权
    • Two step synthesis of D- and L- &agr;-amino acids and D- and L- &agr;-amino aldehydes
    • D-和L-α-氨基酸和D-和L-α-氨基醛的两步合成
    • US06509506B1
    • 2003-01-21
    • US09171538
    • 1999-04-05
    • K. Barry SharplessGuigen Li
    • K. Barry SharplessGuigen Li
    • C07C20500
    • C07C221/00C07C223/02
    • D- and L- &agr;-amino acids and D- and L-&agr;-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 &bgr;-hydoxycarbamate is deprotected to yield the corresponding &bgr;-hydroxyamine. If sulfonamide is employed as an oxidant nitrogen source, the resultant &bgr;-hydroxysulfonamide is deprotected to yield the corresponding &bgr;-hydroxyamine. The resultant &bgr;-hydroxyamine is then selectively oxidized in a second synthetic step to produce the desired D- and L- &agr;-amino acid or D- and L-&agr;-amino aldehyde.
    • D-和L-α-氨基酸和D-和L--α-氨基醛在两个步骤中由烯烃底物合成。 第一步是对烯烃底物的催化不对称氨基羟基化加成反应。 加成反应由锇催化并被手性配体共催化。 除了与锇共助催化剂之外,手性配体还用于区域选择性和对映选择性地引导加成反应,因为二价配体优于单价配体,因为它们具有增强的区域和对映选择性。 作为加成反应的氧化剂氮源,可以使用氨基甲酸酯或磺酰胺。 如果使用氨基甲酸酯作为氧化剂氮源,则将所得的β-羟基氨基甲酸酯脱保护,得到相应的β-羟基胺。 如果使用磺酰胺作为氧化剂氮源,则将所得的β-羟基磺酰胺脱保护,得到相应的β-羟基胺。 然后在第二合成步骤中选择性氧化得到的β-羟基胺,以产生所需的D-和L-α-氨基酸或D-和L--α-氨基醛。
    • 3. 发明授权
    • Two step synthesis of D- and L- .alpha.-amino acids and D- and L-
.alpha.-amino-aldehydes
    • D-和L-α-氨基酸和D-和L-α-氨基醛的两步合成
    • US5994583A
    • 1999-11-30
    • US651228
    • 1996-05-22
    • K. Barry SharplessGuigen Li
    • K. Barry SharplessGuigen Li
    • C07C213/08C07C227/32C07C269/04C07C269/06C07C303/40C07C311/21C07F9/40C07C229/04
    • C07F9/4056C07C213/08C07C227/32C07C269/04C07C269/06C07C303/40C07F9/4006C07B2200/07
    • D- and L-.alpha.-amino acids and D- and L-.alpha.-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 enhance 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 .beta.-hydroxycarbamate is deprotected to yield the corresponding .beta.-hydroxyamine. If sulfonamide is employed as an oxidant nitrogen source, the resultant .beta.-hydroxysulfonamide is deprotected to yield the corresponding .beta.-hydroxyamine. The resultant .beta.-hydroxyamine is then selectively oxidized in a second synthetic step to produce the desired D- and L-.alpha.-amino acid or D- and L-.alpha.-amino aldehyde.
    • D-和L-α-氨基酸和D-和L-α-氨基醛在两个步骤中由烯烃底物合成。 第一步是对烯烃底物的催化不对称氨基羟基化加成反应。 加成反应由锇催化并被手性配体共催化。 除了与锇共助催化剂之外,手性配体还用于区域选择地和对映选择性地引导加成反应。 二价配体优于一价配体,因为它们具有增强的区域和对映选择性。 作为加成反应的氧化剂氮源,可以使用氨基甲酸酯或磺酰胺。 如果使用氨基甲酸酯作为氧化剂氮源,则将得到的β-羟基氨基甲酸酯脱保护,得到相应的β-羟基胺。 如果使用磺酰胺作为氧化剂氮源,则所得的β-羟基磺酰胺被去保护,得到相应的β-羟基胺。 然后在第二合成步骤中选择性地氧化所得的β-羟基胺以产生所需的D-和L-α-氨基酸或D-和L-α-氨基醛。
    • 4. 发明授权
    • Catalytic asymmetric aminohydroxylation of olefins with carbamates
    • 烯烃与氨基甲酸酯的催化不对称氨基羟基化
    • US5767304A
    • 1998-06-16
    • US651104
    • 1996-05-21
    • K. Barry SharplessGuigen Li
    • K. Barry SharplessGuigen Li
    • C07C227/20C07C229/34C07C269/00C07F9/40C07C271/16
    • C07F9/4056C07C227/20C07C269/00C07F9/4006C07C2102/10
    • .beta.-Hydroxyamines and .beta.-hydroxycarbamates are synthesized from olefin substrates by means on a catalyzed asymmetric addition reaction. 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 enhance regio- and enantio-selectivity. Carbamates are employed as an oxidant nitrogen source for the production of .beta.-hydroxysulfonamides. Excellent yields and enantiomeric efficiencies are achieved with co-solvents containing a 50/50 (v/v) mixtures of water and organic solvent. The performance of the reaction is further enhanced by omitting the addition silver or mercurial salts conventionally employed in asymmetric aminohydroxylation additions to olefins performed in neat or substantially neat solvents. .beta.-Hydroxyamines are then obtained by deprotecting the corresponding .beta.-hydroxycarbamate.
    • 通过催化不对称加成反应,通过烯烃底物合成β-羟基胺和β-羟基氨基甲酸酯。 加成反应由锇催化并被手性配体共催化。 除了与锇共助催化剂之外,手性配体还用于区域选择地和对映选择性地引导加成反应。 二价配体优于一价配体,因为它们具有增强的区域和对映选择性。 使用氨基甲酸酯作为生产β-羟基磺酰胺的氧化剂氮源。 使用含有水和有机溶剂的50/50(v / v)混合物的共溶剂可获得优异的收率和对映体效率。 通过省略常规用于在纯净或基本上纯的溶剂中进行的烯烃的不对称氨基羟基化添加中的加成银或汞盐进一步提高反应的性能。 然后通过脱保护相应的β-羟基氨基甲酸酯得到β-羟基胺。