Catalytic guanylation of aliphatic, aromatic, heterocyclic primary and secondary amines using nanocrystalline zinc(II) oxide
作者:M. Lakshmi Kantam、S. Priyadarshini、P.J. Amal Joseph、P. Srinivas、A. Vinu、K.J. Klabunde、Yuta Nishina
DOI:10.1016/j.tet.2012.05.044
日期:2012.7
to be a highly efficient heterogeneous catalyst for the guanylation of amines with various carbodiimides to afford N,N′,N″-trisubstituted guanidines in excellent yields. Structurally divergent aliphatic, aromatic, heterocyclic primary and secondaryamines were converted to the corresponding N,N′,N″-trisubstituted guanidines using optimal conditions. The catalyst was easy to handle even under atmospheric
[EN] PROCESS FOR SYNTHESIZING CARBAPENEM ANTIBIOTICS<br/>[FR] PROCEDE POUR SYNTHETISER DES ANTIBIOTIQUES CARBAPENEMS
申请人:MERCK & CO., INC.
公开号:WO1999045010A1
公开(公告)日:1999-09-10
(EN) A process for the direct crystallization of a compound of formula (I) or a pharmaceutically acceptable salt thereof, is disclosed, wherein R1 and R2 represent H, C1-10 alkyl, aryl or heteroaryl, or substituted C1-10 alkyl, aryl or heteroaryl and X+ represents a charge balancing group, comprising extracting a solution containing a crude compound of formula (I) or (Ia) or a pharmaceutically acceptable salt thereof, wherein each X+ is a charge balancing group, and R1 and R2 are as described above with a C4-10 alcohol, collecting and crystallizing the resulting aqueous phase to produce a crystalline compound of formula (I).(FR) L'invention concerne un procédé de cristallisation directe d'un composé de la formule (I) ou d'un sel pharmaceutiquement acceptable dudit composé. Dans ladite formule, R1 et R2 sont H, alkyle C1-10, aryle ou hétéroaryle, ou alkyle C1-10 substitué, aryle ou hétéroaryle, et X+ est un groupe d'équilibrage de charge, le procédé consistant à extraire une solution contenant un composé brut de la formule (I) ou (Ia) ou un sel pharmaceutiquement acceptable dudit composé. Dans lesdites formules, chaque X+ est un groupe d'équilibrage de charge; R1 et R2 sont tels que décrits ci-dessus et contiennent un alcool C4-10, le procédé consistant à recueillir et cristalliser la phase aqueuse résultante pour produire un composé cristallin de la formule (I).
[EN] PROCESS FOR PREPARATION OF ERTAPENEM AND SALTS THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ERTAPÉNÈME ET DE SES SELS
申请人:UNIMARK REMEDIES LTD
公开号:WO2015087245A1
公开(公告)日:2015-06-18
The present invention relates to an improved process for the preparation of Ertapenem of formula (I) and its pharmaceutically acceptable salts, or hydrates, or solvates thereof. Formulae (I):
Titanacarborane mediated C–N bond forming/breaking reactions
作者:Hao Shen、Zuowei Xie
DOI:10.1016/j.jorganchem.2008.11.010
日期:2009.5
Constrained-geometry titanacarboranes [sigma: eta(1):eta(5)-(OCH2)(R2NCH2)C2B9H9]Ti(NR2) (R = Me, Et) are synthesized via an unexpected reaction of [Me3NH][mu-7,8-CH2OCH2-7,8-C2B9H10] with Ti(NR2)(4) (R = Me, Et), involving a C-O bond cleavage and C-N bond formation. These complexes can be readily converted to new amide species or alkoxide by reacting with amines or esters, respectively. Insertion of a series of unsaturated molecules into the Ti-N bond of the aforementioned complexes results in the formation of various half-sandwich titanacarboranes. [sigma: eta(1): eta(5)-(OCH2)(Me2NCH2)C2B9H9]Ti(NMe2) is also able to efficiently catalyze the hydroamination of carbodiimides and the transamination of guanidines. These results are summarized in this brief account. (C) 2008 Elsevier B.V. All rights reserved.