A Facile Synthesis of New 5H-Indazolo[3,2-b]benzo[d]-1,3-oxazines via One-Pot Intramolecular Bis-heterocyclizations
摘要:
[GRAPHICS]The parent 5H-indazolo[3,2-b]benzo[d]-1,3-oxazine heterocycle as well as a series of novel analogues have been synthesized utilizing two subsequent intramolecular heterocyclizations in one pot. A variety of diversity groups were added to explore the scope of this reaction and to provide a number of new compounds for biological screening.
The chemistry of 2<i>H</i>-3,1-benzoxazine-2,4(1<i>H</i>)-dione (Isatoic Anhydride).<b>19</b>. Direct formation of 2-aminobenzyl alcohols from the reduction of<i>N</i>-substituted isatoic anhydrides
作者:Gary M. Coppola
DOI:10.1002/jhet.5570230145
日期:1986.1
Isatoicanhydrides 1 are easily reduced with sodium borohydride to o-(substituted-amino)benzyl alcohols 3 in good yield. Sequential reduction of N-(2-nitrobenzyl)isatoicanhydride (5) with sodium borohydride followed by catalytic hydrogenation of the nitro group affords the naturally occurring 2-(2′-aminobenzylamino)-benzyl alcohol (4) in 72% yield.