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2005
Benzopyran derivatives
R 0350
Thermal Ring Closure Reaction of 4-Methyl-7-(1,1-disubstituted propyneThe Effects of the Substituents at Propargylic Position
21- 144 -2-yloxy)chromen-2-ones:
on Reactivity and Products. — The bulkiness of the substituents at the propargylic
site of the title propynyloxychromenones [cf. (III)] are shown to possess a significant
effect on the reactivity and the ratio of the two heterocyclic scaffolds, pyranochromenones and furanochromenones. The bulkier the substituents, the greater is the portion
of the furanochromenone product. — (ZHANG, Q.; CHEN, Y.; XIA, Y.; YANG, Z.;
XIA*, P.; Synth. Commun. 34 (2004) 24, 4507-4515; Dep. Med. Chem., Fudan Univ.,
Shanghai 200032, Peop. Rep. China; Eng.) — H. Toeppel
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