摘要:
The present invention relates to the preparation of optically resolved chiral compounds of ²-amino acid type active pharmaceutical ingredients (API), more specifically to ²-aminobutyryl substituted compounds and especially ²-aminobutyryl compounds having ³-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:
An object of the present invention is to provide an auxin biosynthesis inhibitor superior to L-AOPP. The object can be attained by a compound represented by general formula (I): wherein, R 1 to R 5 and X are the same as defined in the specification or a salt or solvate thereof.
摘要:
There is provided a process for the preparation of a compound of formula (II), wherein R 1 , R 2 , R 3 and R 4 are as described in the description. Such compounds may, for example, be useful intermediates in the synthesis of drugs such as Dronedarone.
摘要:
Die vorliegende Erfindung ist auf ein Verfahren zur Herstellung von N-Hydroxylaminderivaten gerichtet. Diese Verbindungen lassen sich leicht zum Beispiel durch hydrogenolytische Spaltung in die entsprechenden Amine umwandeln. Derartige Amine sind wichtige Intermediate in der chemischen (Groß)Synthese. Das vorliegende Verfahren bezieht sich insbesondere auf ein Verfahren zur Herstellung von enantiomerenangereicherten N-Hydroxylaminderivaten ausgehend von Oximderivaten der allgemeinen Formel (I).
摘要:
The present invention relates to open chain alkoxyamine compounds, a polymerizable composition comprising a) at least one ethylenically unsaturated monomer and b) at least one open chain alkoxyamine compound. Further aspects of the present invention are a process for polymerizing ethylenically unsaturated monomers, and the use of open chain alkoxyamine compounds for controlled polymerization. The intermediate N-oxyl derivatives, a composition of the N-oxyl derivatives with ethylenically unsaturated monomers and a free radical initiator X, as well as a process and their use for polymerization are also subjects of the present invention.