An organocatalytic Cloke–Wilson rearrangement of cyclopropyl ketones to 2,3-dihydrofurans is exploited utilizing the homoconjugate addition process. With 1,4-diazabicyclo[2.2.2]octane as the catalyst, the rearrangement in DMSO at 120 °C proceeded in generally high yields, exclusive regioselectivity, and a broad substrate scope. An examination of the mechanism including stereochemical analysis and intermediate
2,4,5-Trisubstituted-2,3-dihydrofurans useful for fungicidal applications are provided herein. The 2,3-dihydrofuran compounds correspond to the general formula ##STR1## where R is an ethyl or vinyl group, R.sub.1 is a C.sub.1-10 hydrocarbon radical and X is a nitrile, amide or sulfonyl group. The compounds of this invention are effective fungicides for the treatment of seeds and also find use in other agricultural fungicidal applications.
Dihydrofuran derivates useful as aroma chemicals, and process for their preparation
申请人:QUANTUM CHEMICAL CORPORATION (a Virginia corp.)
公开号:EP0128584A1
公开(公告)日:1984-12-19
2,4,5-trisubstituted-2,3-dihydrofurans useful as fragrance compounds are provided herein. The compounds of this invention correspond to the general formula
wherein R is an ethyl or vinyl group, R2 is an alkyl group having from 1 to 4 carbon atoms and R1 is a hydrocarbon radical having from 3 to 10 carbon atoms. The 2,3-dihydrofuran compounds of the present invention are useful components in the preparation and formulation of fragranced cosmetic and toiletry products.