hydrazides to triply protected hydrazines and included a large number of intermediates of principal synthetic interest. In the case of mono- and disubstituted hydrazines the results demonstrate apparent advantages of pentavalent over trivalent reagents, exemplified by fast, highly chemoselective monoarylation of acylhydrazines at the terminal nitrogen. In contrast, trisubstituted hydrazines are more efficiently
Efficient Methodology for Selective Alkylation of Hydrazine Derivatives
作者:Aleksei Bredihhin、Ulrich M. Groth、Uno Mäeorg
DOI:10.1021/ol070026w
日期:2007.3.1
Formation and use of a nitrogen dianion for selective hydrazine alkylation is reported. The scope and limitations of a new method were demonstrated. The novel method provides fast and easy access to substituted hydrazines, which are widely used as drugs, pesticides, and precursors for a variety of compounds in organic synthesis.
Zinc-Mediated Allylation and Benzylation of Phenylazocarboxylic Esters
作者:Roman Lasch、Markus R. Heinrich
DOI:10.1021/acs.joc.5b01978
日期:2015.10.16
Allylation and benzylation of phenylazocarboxylic tert-butyl esters have been achieved under Barbier-type reaction conditions and in very short reactions times using the corresponding allyl and benzyl bromides or iodides in combination with zinc powder. Whereas all reactions occurred exclusively at the beta-nitrogen atom of the azocarboxylic esters, the linkage of allyl units was shown to depend on the substitution pattern at the double bond of the allyl halide. The hydrazines obtained are useful precursors for indoles and indazoles.
N-Benzylnaltrindoles as Long-Acting .delta.-Opioid Receptor Antagonists
作者:V. L. Korlipara、A. E. Takemori、P. S. Portoghese
DOI:10.1021/jm00038a018
日期:1994.6
The indolic nitrogen of the delta-opioid receptor antagonist, naltrindole (1), was derivatized with benzyl or substituted benzyl to afford a series (2-9) that retained delta-opioid receptor antagonist activity and selectivity in vitro. The two most potent members (2 and 8) of the series were evaluated in mice and were found to produce delta-selective antagonism of [D-Ser(2),Leu(5)] enkephalin-Thr(6) which lasted 5 days. N-Benzylnaltrindole (2) should be useful as a delta(2)-selective antagonist for in vivo studies where prolonged action is desired.
KATRITZKY, ALAN R.;RAO, M. SURESH CHANDER, J. CHEM. SOC. PERKIN TRANS. PT 1,(1989) N2, C. 2297-2303