摘要:
A process for producing N -6 demethylated 9,10-dihydrolysergic acid alkyl ester is described, which comprises a step of N -6 demethylation of 9,10-dihydrolysergic acid alkyl esters with chloroformate and wherein the N -6 demethylation step is performed in the presence of an organic catalyst. Further, a process for converting a compound of formula (I) (DHLSAIkyl) into a compound of formula (Il) (DHLSAIkyl-F) comprises the steps of: providing (and maintaining) a reaction medium free of water and/or HCI, and reacting DHLSAIkyl with chloroformate in said reaction medium free of water and/or HCI, to obtain the compound of formula (Il) (DHLSAIkyl-F).
摘要:
One embodiment disclosed in the invention is the efficient synthesis of halogenated biaryl starting material via Grignard chemistry and the use thereof. Another embodiment of the invention is the reaction of catalyzed carbonylation of the 3'-(2'-halo-biphenyl-4-ylmethyl)-1,7'-dimethyl-2'-propyl-1H,3'H-[2,5']bibenzoimidazolyl (TLMH) using either gaseous carbon monoxide in a solvent mixture containing water; or formic acid salts optionally together with acetic acid in anhydrous solvent.
摘要:
The present invention relates to the field of organic chemistry, and in particular to the preparation of β-borated compounds. These β-borated compounds can be used as intermediates in the synthesis pharmaceutically active agents such as sitagliptin.
摘要:
The present invention relates to the preparation of optically resolved chiral compounds of β-amino acid type active pharmaceutical ingredients (API), more specifically to β-aminobutyryl substituted compounds and especially β-aminobutyryl compounds having γ-bound aryl groups. The present invention more particularly relates to the preparation of enantiomerically enriched chiral compounds useful as intermediates for the preparation of anti-diabetic agents, preferably sitagliptin.
摘要:
The present application discloses a process for demethylating aromatic methyl ethers by reaction with 3 -mercaptopropionic acid or salts thereof. One preferred example is the demethylation of venlafaxine forming 0 - desmethylvenlafaxine.
摘要:
The present invention relates to a process for preparing a compound of Formula (Vl), wherein R1 and R6 are hydrogen, substituted or unsubstituted alkyl substituted or unsubstituted aryl, or substituted or unsubstituted aralkyl; R5 is OR2, NR2R3, SR2, B (OR2)(OR3), or X" selected from F, Cl, Br, I, OCOR2, OSO2R2, wherein R2 and R3 independently from each other represent substituted or unsubstituted alkyl, substituted or unsubstituted aryl, or substituted or unsubstituted aralkyl; or R2 and R3 cooperatively form a part of a 5- to 10-membered fused or unfused ring, optionally a chiral 5- to 10- membered fused or unfused ring; X is selected from F1 Cl, Br, I; and * indicates a chiral center; by hydrogenation of a compound of Formula (V), wherein R1, R5, R6 and X are as defined above; wherein hydrogenation is conducted in the presence of a catalyst selected from complexes comprising at least one transition metal, wherein dehalogenation occurs in less than 10 molar % relative to the molar amount of the compound of formula Vl.
摘要:
The present invention relates to a process for the purification of olanzapine, characterized in that said process comprises at least the following steps: (A) providing a solution of olanzapine in at least one organic solvent, (B) treating the solution obtained in step (A) with at least one non-acidic oxide adsorbent, and (C) removing the said non-acidic oxide adsorbent from the solution obtained in step (B), in order to obtain a solution of olanzapine in a pure form, to a mixture comprising olanzapine and at least one addition product of methylene chloride and olanzapine in an amount of 10 to 280 ppm, to a pharmaceutical formulation, to the use of said mixture and to a method of treating mental diseases and conditions, which comprises administering a therapeutically effective amount of said mixture in conjunction with a pharmaceutically acceptable diluent or carrier.
摘要:
The present invention relates in general to the field of organic chemistry and in particular to the preparation of N -(4-(4-fluorophenyl)-6-isopropyl-5-methylpyrimidin-2-yl)- N - methylmethanesulfonamide (I), N -(4-(4-fluorophenyl)-5-(bromomethyl)-6-isopropylpyrimidin-2- yl)- N -methylmethanesulfonamide (II) and N -(4-(4-fluorophenyl)-5-(hydroxymethyl)-6- isopropylpyrimidin-2-yl)- N -methylmethanesulfonamide (III), key intermediates in preparation of Rosuvastatin.
摘要:
The present invention relates in general to the field of organic chemistry and in particular to the preparation of alpha-amino boronic esters. These compounds can be used as intermediates in the synthesis of boronic acid and ester compounds such as N- terminal peptidyl boronic acid derivatives, for example N-(pyrazin-2-yl)carbonyl-L-phenylalanine-L-leucine boronic acid, i.e. bortezomib.
摘要:
The invention relates to commercially viable process for the synthesis of key intermediates for the preparation of statins, in particular Rosuvastatin and Pitavastatin or respective pharmaceutically acceptable salts thereof. A new simple and short synthetic route for key intermediates is presented which benefits from the use of cheap and readily available starting materials, by which the conventionally most frequently used DIBAL-H as reducing agent can be avoided.