A Van Leusen deprotection-cyclization strategy as a fast entry into two imidazoquinoxaline families.

A Van Leusen deprotection-cyclization strategy as a fast entry into two imidazoquinoxaline families.
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DOI:
10.1016/j.tetlet.2012.08.072
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发表时间:
2012-10-24
影响因子:
1.8
通讯作者:
Hulme, Christopher
Hulme, Christopher
中科院分区:
化学4区
文献类型:
--
作者:
De Moliner, Fabio;Hulme, Christopher

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A concise synthesis of two pharmacologically relevant classes of molecules possessing the imidazoquinoxaline core is reported. The protocol involves use of 1,2-phenylenediamines and glyoxylic acid derivatives, namely ethyl glyoxylate or benzylglyoxamide, along with tosylmethylisocyanides in a microwave-assisted Van Leusen three-component condensation. Subsequent unmasking (Boc removal) of an internal amino-nucleophile promotes deprotection and cyclization that take place either spontaneously in a one-pot fashion to give 8 or upon acidic treatment under microwave irradiation after isolation of the imidazole intermediate to give 11. Of note, a tricyclic framework is hence assembled by means of a rapid and straightforward method with a high bond-forming efficiency.
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