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2004
Benzopyran derivatives
R 0350
Catalytic Asymmetric Cyclocarbonylation of o-Isopropenylphenols: EnantioSynthesis of Six-Membered Ring Lactones. — The first examples of the ti47- 126 selective
tle reaction are reported giving chiral methylcoumarins. The enantioselectivity strongly
depends on the structure of substrate and ligand as well as on the solvent used. The
products are important building blocks for natural and biologically active compounds.
— (DONG, C.; ALPER*, H.; J. Org. Chem. 69 (2004) 15, 5011-5014; Dep. Chem.,
Univ. Ottawa, Ottawa, Ont. K1N 6N5, Can.; Eng.) — Jannicke
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