Repurposing the 3‐Isocyanobutanoic Acid Adenylation Enzyme SfaB for Versatile Amidation and Thioesterification
作者:Mengyi Zhu、Lijuan Wang、Jing He
DOI:10.1002/anie.202010042
日期:2021.1.25
molecules with novel skeletons, but also to identify the enzymes that catalyze diverse chemical reactions. Exploring the substrate promiscuity and catalytic mechanism of those biosynthetic enzymes facilitates the development of potential biocatalysts. SfaB is an acyladenylate‐forming enzyme that adenylates a unique building block, 3‐isocyanobutanoic acid, in the biosynthetic pathway of the diisonitrile
Verfahren zur Herstellung von N-acylierten Mercapto-Alpha-aminosäuren
申请人:Degussa Aktiengesellschaft
公开号:EP0304778A1
公开(公告)日:1989-03-01
N-acylierte Mercapto-α-aminosäuren der allgemeinen Formel
werden dadurch hergestellt, daß man ein Nitril der allgemeinen Formel
R¹-CN (II)
bei einer Temperatur zwischen 0°C und 100°C in Wasser oder in einer Mischung aus Wasser und einem mit Wasser zumindest teilweise mischbaren organischen Lösungsmittel in Gegenwart einer Base mit einer Mercapto-α-aminosäure der allgemeinen Formel
umsetzt und anschließend mit einer Säure die N-acylierte Mercapto-α-aminosäure der allgemeinen Formel (I) freisetzt. Auf diese Weise können Mercapto-α-aminosäuren auf relativ einfache Weise selektiv an der Aminogruppe acyliert werden
通式的 N-酰化巯基-α-氨基酸是由通式为
是由通式为
R¹-CN (II)
在 0°C 至 100°C 的温度下,在水中或水与至少部分与水混溶的有机溶剂的混合物中,在碱存在下与通式为 R¹-CN (II) 的巯基-α-氨基酸反应
然后用酸释放通式(I)的 N-酰化巯基-α-氨基酸。这样,巯基-α-氨基酸就能以相对简单的方式在氨基上进行选择性酰化。
PHOTO-CURING MATERIAL MANUFACTURING METHOD, AND PHOTO-CURING MATERIAL AND ARTICLE
申请人:Asahi Glass Company Limited
公开号:EP2360195A1
公开(公告)日:2011-08-24
To provide a photocurable material which can form a cured product having a high transparency and a high refractive index, a process for producing the material easily, and an article having a high transparency and a high refractive index.
The photocurable material is obtained by a production process comprising (i) a step of reacting a polymerizable component (A) comprised of at least one type of a compound (a) having a (meth)acryloyloxy group, and a compound (B) having a mercapto group and a carboxy group to obtain a surface modifier (C) which has the carboxy group derived from the compound (B) at a terminal, (ii) a step of modifying the surface of inorganic fine particles (D) with the surface modifier (C) to obtain surface-modified inorganic fine particles (E), and (iii) a step of obtaining a photocurable material which contains the surface-modified inorganic fine particles (E), a polymerizable component (F) comprised of at least one type of a compound (f) having a (meth)acryloyloxy group, and a photopolymerization initiator (G).
Hair relaxer compositions comprising at least one hydroxide compound and at least one activating agent, and methods of using the same
申请人:——
公开号:US20020159962A1
公开(公告)日:2002-10-31
A composition for lanthionizing keratin fibers comprising at least one hydroxide compound, with the proviso that said at least one hydroxide compound is not sodium hydroxide, lithium hydroxide or potassium hydroxide; and at least one activating agent chosen from cysteine-based compounds; and methods and kits for use thereof.
Effects of surfactants on the interaction of vitamin B12a with cysteine and N-alkanoylcysteines in water and in benzene. Influence of aqueous micelles and solvent restrictions