Synthesis and Activity of 6-Substituted Purine Linker Amino Acid Immunostimulants
作者:Boulos Zacharie、Lyne Gagnon、Giorgio Attardo、Timothy P. Connolly、Yves St-Denis、Christopher L. Penney
DOI:10.1021/jm960844m
日期:1997.8.1
Further, this potent in vitro activity was reflected as a significant increase in CTL cell number in vivo. However, immunophenotyping of some of the other equipotent compounds did not reveal a parallel relative increase in CTLs in vivo. It was difficult to formulate a rigorous structure-activity relationship based on in vitro CTL activity. Nevertheless, the activity was dependent upon the nature of
Treatment of 7-phenyl-6-heptynal dimethyl acetal with iodotrimethylsilane afforded 2-(1-iodobenzylidene)cyclohexyl methyl ether via the intramolecular nucleophilic attack of the carbon-carbon triple bond to the oxonium ion generated by the action of iodotrimethylsilane.
Selective synthesis of halosilanes from hydrosilanes and utilization for organic synthesis
作者:Atsutaka Kunai、Joji Ohshita
DOI:10.1016/s0022-328x(03)00254-7
日期:2003.11
Selective synthesis of halosilanes has been examined. Various types of halosilanes and halohydrosilanes, such as R3SiX, R2SiHX, R2SiX2, RSiH2X, RSiHX2 (X = Cl, Br, F), were obtained by the reactions of the corresponding hydrosilanes with Cu(II)-based reagents selectively in high yields. This method could be also applied to the synthesis of chlorofluorosilanes and chlorohydrogermanes. On the other hand, iodo- and bromosilanes and germanes were obtained by Pd- or Ni-catalyzed hydride-halogen exchange reactions of hydrosilanes with alkyl or allyl halides. Their synthetic applications have been demonstrated by using iodo-and bromosilanes and chlorofluorosilanes. (C) 2003 Elsevier Science B.V. All rights reserved.