Facile Regiocontrolled Synthesis of Trialkyl-Substituted Pyrazines
摘要:
alpha-Nitro ketones can be transformed selectively into trialkyl-substituted pyrazines via reaction with a-amino ketones using octyl viologen as an electron-transfer reagent. The new synthetic method, and the optimal reaction conditions that allow for the regiochemical control, are described.
Nitroaldol (Henry) reaction catalyzed by amberlyst A-21 as a far superior heterogeneous catalyst.
作者:Roberto Ballini、Giovanna Bosica、Paola Forconi
DOI:10.1016/0040-4020(95)00996-5
日期:1996.1
β-Nitroalcohols can be efficiently obtained with the help of AmberlystA-21, as heterogeneous basic catalyst, with or without solvent. This method is farsuperior to the heterogeneouscatalysts previously reported for the nitroaldol (Henry) reaction, in fact it gives higher yields with primary and secondary nitroalkanes, the formation of by-products such as nitroalkenes is avoited even if aromatic
β-Nitroalcohols can be readily obtained in high yields by the one-pot reaction of aldehydes with nitrecompounds in the presence of Et3N, Bu4NF·3H2O and tBuMe2SiCl. Model experiments indicated that trialkylsilyl nitronic esters are not reaction intermediates.
NOVEL COMPOUNDS AND METHODS FOR SYNTHESIS AND THERAPY
申请人:BISCHOFBERGER NORBERT W.
公开号:US20050176758A1
公开(公告)日:2005-08-11
Novel compounds are described. The compounds generally comprise an acidic group, a basic group, a substituted amino or N-acyl and a group having an optionally hydroxylated alkane moiety. Pharmaceutical compositions comprising the inhibitors of the invention are also described. Methods of inhibiting neuraminidase in samples suspected of containing neuraminidase are also described. Antigenic materials, polymers, antibodies, conjugates of the compounds of the invention with labels, and assay methods for detecting neuraminidase activity are also described.