A series of 9-(acylamino)doxycycline derivatives has been prepared. These analogs exhibit good activity against both tetracycline sensitive and tetracycline resistant Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria that are encoded with the efflux and ribosomal resistance gene factors. N,N-Dialkylglycylamido derivatives possessed the highest activity. Replacement of glycine moiety with other amino acids did not further enhance the activity.
Synthesis of Multi-Functionalized Chromeno[2,3-c]pyrrol-9(2H)-ones: Investigation and Application of Baker-Venkataraman Rearrangement Involved Reactions Catalyzed by 4-(Dimethylamino)pyridine
作者:Yanjun Yu、Yun Hu、Weiyan Shao、Jianing Huang、Yinglin Zuo、Yingpeng Huo、Linkun An、Jun Du、Xianzhang Bu
DOI:10.1002/ejoc.201100435
日期:2011.8
An efficient one-potsynthesis of multi-functionalized chromeno[2,3-c]pyrrol-9(2H)-onesfrom 1,3-diaryl-1,3-diketones and amino acids is described. The synthesis is based on the 4-(dimethylamino)pyridine-catalyzed Baker–Venkataraman rearrangement and subsequent reactions.
Sterically Hindered <i>C</i><sup>α</sup><sup>,</sup><sup>α</sup>-Disubstituted α-Amino Acids: Synthesis from α-Nitroacetate and Incorporation into Peptides
作者:Yanwen Fu、Lars G. J. Hammarström、Tod J. Miller、Frank R. Fronczek、Mark L. McLaughlin、Robert P. Hammer
DOI:10.1021/jo015809o
日期:2001.10.1
demanding C(alpha,alpha)-dibenzylglycine (Dbg) has been incorporated into a peptide using solid-phase synthesis. It was found that once sterically congested Dbg is at the peptide N-terminus, further chain extension becomes very difficult using uronium or phosphonium salts (PyAOP, PyAOP/HOAt, HATU). However, preformed aminoacid symmetrical anhydride couples to N-terminal Dbg in almost quantitative yield
Izdebski, J.; Pawlak, D., Polish Journal of Chemistry, 1994, vol. 68, # 2, p. 403 - 406
作者:Izdebski, J.、Pawlak, D.
DOI:——
日期:——
Efficient Acylation of the <i>N</i>-Terminus of Highly Hindered <i>C</i><sup>α</sup><sup>,</sup><sup>α</sup>-Disubstituted Amino Acids via Amino Acid Symmetrical Anhydrides
作者:Yanwen Fu、Robert P. Hammer
DOI:10.1021/ol016965k
日期:2002.1.1
GRAPHICSFmoc amino acid symmetrical anhydrides are efficient and readily available reagents for acylation of the N-terminus of highly hindered C-alpha,C-alpha-dialkylated alpha-amino acids. Comparison of a variety of coupling protocols showed that the symmetrical anhydride method always provided the superior results. This method was successfully applied to the solid-phase synthesis of a peptide containing three alphaalphaAAs at alternating positions.