期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 27, 页码 7831-7835出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201600878
关键词
annulations; carbenoids; diazo compounds; heterocycles; rhodium
资金
- Department of Science and Technology
- IISER Bhopal
- UGC-New Delhi
A novel rhodium-catalyzed dienamine activation of diazoenals resulted in a new class of gamma-functionalized donor-acceptor dienamines. The synthetic utility of these dienamines has been demonstrated in a cooperative rhodium(II)/Bronsted acid and gold(I)-catalyzed direct [3+3] annulation of enaldiazo ketones with N-propargyl anilines, thus leading to highly substituted enal-functionalized 1,4-oxazines. The reaction is proposed to involve dienamine activation through the diacceptor rhodium enalcarbenoid NH-insertion and a gold-catalyzed intramolecular site-selective 6-exo-dig heterocyclization. The methodology was applied to the efficient synthesis of structurally complex [1,4] oxazino[4,3-a]quinolone, which is present in the antibacterial agent PNU-286607.
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