Synthesis of N-acyl-N,O-acetals from N-aryl amides and acetals in the presence of TMSOTf
摘要:
Secondary amides undergo in situ silyl imidate formation mediated by TMSOTf and an amine base, followed by addition to acetal acceptors to provide N-acyl-N,O-acetals in good yields. An analogous, high-yielding reaction is observed with 2-mercaptothiazoline as the silyl imidate precursor. Competing reduction of the acetal to the corresponding methyl ether via transfer hydrogenation can be circumvented by the replacement of CY2NMe with 2,6-lutidine under otherwise identical reaction conditions. (C) 2011 Elsevier Ltd. All rights reserved.
POLYIMIDE, DIAMINE COMPOUND AND METHOD FOR PRODUCING THE SAME
申请人:Yamaguchi Hiroaki
公开号:US20100041860A1
公开(公告)日:2010-02-18
A polyimide obtained by reacting a tetracarboxylic acid component with a diamine component containing a diamine compound represented by the following general formula (1):
wherein, A represents a biphenylene group which may be substituted with an alkyl group having up to 4 carbon atoms.
Synthesis of N-acyl-N,O-acetals from N-aryl amides and acetals in the presence of TMSOTf
作者:C. Wade Downey、Alan S. Fleisher、James T. Rague、Chelsea L. Safran、Megan E. Venable、Robert D. Pike
DOI:10.1016/j.tetlet.2011.07.023
日期:2011.9
Secondary amides undergo in situ silyl imidate formation mediated by TMSOTf and an amine base, followed by addition to acetal acceptors to provide N-acyl-N,O-acetals in good yields. An analogous, high-yielding reaction is observed with 2-mercaptothiazoline as the silyl imidate precursor. Competing reduction of the acetal to the corresponding methyl ether via transfer hydrogenation can be circumvented by the replacement of CY2NMe with 2,6-lutidine under otherwise identical reaction conditions. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis and structural studies of rhenium(I) tricarbonyl complexes with thione containing chelators
作者:Leonor Maria、Carolina Moura、António Paulo、Isabel C. Santos、Isabel Santos
DOI:10.1016/j.jorganchem.2006.07.032
日期:2006.11
interactions in the crystal structure of 2. For both compounds the rhenium atom adopts a slightly distorted octahedral coordination with a facial arrangement of the carbonyl ligands. The three remaining coordination positions are occupied by the two thione sulfur atoms from the anchor ligands, and by an agostic hydride (1) or a bromide ligand (2). Compound 1 is highly stable either in the solid state