期刊
TETRAHEDRON
卷 62, 期 41, 页码 9694-9700出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2006.07.084
关键词
chromones; cyclizations; domino reactions; oxygen heterocycles; silyl enol ethers
The TiCl4-mediated [3+3] cyclization of 2,4-bis(trimethylsilyloxy)penta-1,3-diene with 3-silyloxyalk-2-en-1-ones afforded 2-acetylphenols, which were transformed into functionalized chromones. The Me3SiOTf-mediated condensation of the latter with 1,3-bis(silyl enol ethers) and subsequent domino 'retro-Michael-aldol-lactonization' reaction afforded 7-hydroxy-6H-benzo[c]chromen-6-ones. (c) 2006 Elsevier Ltd. All rights reserved.
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