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Synthesis of 2,2,4-triphenyl-3-propenoyl-3,4-dihydro-2H-benzopyran via a lithiated allene

โœ Scribed by E. A. Adegoke; T. A. Emokpae; H. Ephraim-Bassey


Book ID
112128314
Publisher
Journal of Heterocyclic Chemistry
Year
1986
Tongue
English
Weight
314 KB
Volume
23
Category
Article
ISSN
0022-152X

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Asymmetric synthesis of 4-amino-3,4-dihy
โœ Andreas Burgard; Hans-Jochen Lang; Uwe Gerlach ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 385 KB

Highly enantioselective reduction of 3,4-dihydro-2,2-dimethyl-2H-l-benzopyran-4-ones 3 s-e by BH3 was achieved in the presence of catalytic amounts of Corey's oxazaborolidine 4 to afford the corresponding 3,4-dihydro-2,2dimetbyl-2H-l-~nzopyran-4-ols 2a-e in quantitative yields. These benzopyran-4-ol