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Synthesis of unsymmetrical methylene derivatives of benzopyran-4-ones from mannich bases
Journal of Heterocyclic Chemistry
Vol. 38, Issue 2, p 499–501

DOI:

http://dx.doi.org/10.1002/jhet.5570380232

Synthesis of a New Class of Spirophenanthrones
Synlett 2009 (9) p 1501-1505
Xue-song Wu, Shuang-zheng Lin, Ming-zong Li, Tian-pa You

DOI:

http://dx.doi.org/10.1055/s-0029-1217174

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