cheminform abstract: lewis acid catalyzed cycloaddition of methylenecyclopropanes with...

ChemInform 2010, 41, issue 43 © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim www.cheminform.wiley-vch.de Benzopyran derivatives R 0350 DOI: 10.1002/chin.201043139 Lewis Acid Catalyzed Cycloaddition of Methylenecyclopropanes with Salicylalde- hydes. — Treatment of salicylaldehydes with triethyl orthoformate generates o-qui- nonemethide analogues which undergo efficient Lewis acid catalyzed cycloaddition with methylenecyclopropanes to produce the desired benzopyran products. Variation in the conditions leads to formation of ring-opened ethers such as (VI) or indenes. — (JIANG, M.; SHI*, M.; Org. Lett. 12 (2010) 11, 2606-2609, DOI:10.1021/ol100814a ; State Key Lab. Organomet. Chem., Shanghai Inst. Org. Chem., Chin. Acad. Sci., Shanghai 200032, Peop. Rep. China; Eng.) — Mais 43- 139

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Page 1: ChemInform Abstract: Lewis Acid Catalyzed Cycloaddition of Methylenecyclopropanes with Salicylaldehydes

www.cheminform.wiley-vch.de

Benzopyran derivativesR 0350 DOI: 10.1002/chin.201043139

Lewis Acid Catalyzed Cycloaddition of Methylenecyclopropanes with Salicylalde-hydes. — Treatment of salicylaldehydes with triethyl orthoformate generates o-qui-nonemethide analogues which undergo efficient Lewis acid catalyzed cycloaddition with methylenecyclopropanes to produce the desired benzopyran products. Variation in the conditions leads to formation of ring-opened ethers such as (VI) or indenes. — (JIANG, M.; SHI*, M.; Org. Lett. 12 (2010) 11, 2606-2609, DOI:10.1021/ol100814a ; State Key Lab. Organomet. Chem., Shanghai Inst. Org. Chem., Chin. Acad. Sci., Shanghai 200032, Peop. Rep. China; Eng.) — Mais

43- 139

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