Substitution reactions of 5-nitropyridine-2-sulfonic acid. A new pathway to 2,5-disubstituted pyridines
作者:Jan M. Bakke、Ingrid Sletvold
DOI:10.1039/b305620a
日期:——
We have investigated reactions of 5-nitropyridine-2-sulfonic acid and its potassium salt in which substitution of the sulfonate group by oxygen, nitrogen and halogen nucleophiles has been attempted. By this approach, 2-methoxy- (95% yield), 2-ethoxy- (97%), 2-isopropoxy- (65%), 2-amino- (92%), 2-butylamino- (76%), 2-diethylamino- (62%), 2-ethylamino- (32%), 2-benzylamino- (77%), 2-(R-1-phenylethylamino)-
我们已经研究了5-硝基吡啶-2-磺酸及其钾盐的反应,其中已尝试用氧,氮和卤素亲核试剂取代磺酸根基团。通过这种方法,2-甲氧基-(95%收率),2-乙氧基-(97%),2-异丙氧基-(65%),2-氨基-(92%),2-丁基氨基-(76%), 2-二乙基氨基-(62%),2-乙基氨基-(32%),2-苄基氨基-(77%),2-(R-1-苯基乙基氨基)-(71%)和2-氯-5-硝基吡啶(已获得87%)。没有观察到与苯酚或苯胺的反应。用t-BuOH与2-甲基丙烯一起形成2-羟基-5-硝基吡啶。