A one-pot-three-step route to triazolotriazepinoindazolones from oxazolino-2H-indazoles.
A one-pot-three-step route to triazolotriazepinoindazolones from oxazolino-2H-indazoles.
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DOI:
10.1021/ol3015804
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发表时间:
2012-08-03
期刊:
影响因子:
5.2
通讯作者:
Kurth, Mark J.
中科院分区:
文献类型:
--
作者:
Conrad, Wayne E.;Rodriguez, Kevin X.;Nguyen, Huy H.;Fettinger, James C.;Haddadin, Makhluf J.;Kurth, Mark J.
A one-pot–three-step method has been developed for the conversion of oxazolino-2H-indazoles into triazolotriazepinoindazolones with three points of diversity. Step one of this process involves a propargyl bromide-initiated ring opening of the oxazolino-2H-indazole (available by the Davis-Beirut reaction) to give an N1-(propargyl)-N2-(2-bromoethyl)-disubstituted indazolone, which then undergoes –CH2Br → –CH2N3 displacement (step two) followed by an uncatalyzed intramolecular azide-alkyne 1,3-dipolar cycloaddition (step three) to form the target heterocycle. Employing 7-bromooxazolino-2H-indazole allows for further diversification through, for example, palladium-catalyzed coupling chemistry, as reported here.
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