摘要:
Subject-matter of the present invention is a process for the preparation of optically active phenyl-beta-amino alcohols by means of a specific reduction of the corresponding phenyl-beta-amino ketones. Further subject-matter of the invention are said novel synthesis intermediates and their use for the preparation of active pharmaceutical ingredients.
摘要:
Subject-matter of the present invention is a process for preparing intermediates for the synthesis of optically active beta-amino alcohols by enzymatic reduction of the corresponding beta-amino ketones. Subject-matter of the invention are also said novel synthesis intermediates and the use thereof in the preparation of active pharmaceutical ingredients, among which vilanterol and the salts thereof.
摘要:
A process is provided for preparation of (R)-N-Boc biphenyl alaninol.It provides a preparation process for a compound outlined as compound 4, which includes these operations: in one of the alcohol solvents, asymmetric hydrogenation of 5 in the presence of [Rh(Duanphos)(X)]Y and hydrogen to provide compound 4. Here "Duanphos" is (Rc,Sp)-Duanphos or (Sc,Rp)-Duanphos; X is NBD or/and COD; Y is one or more of BF4, PF6, SbF6. This process has a lot of advantages, such as low cost, safe operation, less pollution and high yield. The product was obtained in >99% purity and ee which is suitable to scale up in industrial scale.
摘要:
The invention relates to an improved process and novel intermediates (4) and (6) for the preparation of pharmaceutically active compound etoricoxib of formula (1).
摘要:
The present invention provides novel synthesis's for obtaining a protecting group aminoxy PEG-6 linker from cost effective, and readily available starting materials and chemicals or modified polyethylene glycols. More specifically, a novel synthesis of obtaining a modified Boc-protected aminoxy PEG-6 linker was achieved so that said linker may be attached to a vector such as a peptide based fragment.
摘要:
The present invention is disubstituted amines of formula (I) and disbustituted amines of formula (II) useful in treating Alzheimer's disease and other similar diseases.
摘要:
A natural type alpha -amino acid which is easily available and inexpensive is converted to a compound represented by the formula (1), which is reacted with an organometallic reagent represented by the formula (2) to obtain an optically active 5-hydroxyoxazolidine derivative represented by the formula (3). The derivative (3) is treated with an acid to obtain an optically active amino ketone derivative represented by the formula (4), which is subjected to reduction, etc. to obtain an optically active amino alcohol derivative represented by the formula (5) or (6). General formula (2) General formula (1) General formula (3) General formula (4) General formula (5) or General formula (6) Thus, the optically active amino alcohol derivative represented by the formula (5) or (6) having a satisfactory optical purity, which is useful as an intermediate for medicines, agricultural chemicals, etc., can be stereoselectively produced stably at low cost from a natural type alpha -amino acid as an easily available, inexpensive starting material without causing racemization. Also provided are: the optically active 5-hydroxyoxazolidine derivative represented by the formula (3) and the amino ketone derivative represented by the formula (4), which are important intermediates for this production; and processes for producing these.