An efficient dehydrogenativeDiels–Alder (DHDA) reaction of prenylderivatives with 2,3‐dichloro‐5,6‐dicyanobenzoquinone (DDQ) has been developed under mild conditions, leading to a series of cyclohexene derivatives with good to excellent yields and excellent diastereoselectivity.
Bismuth Triflate Catalyzed [1,3] Rearrangement of Aryl 3-Methylbut-2-enyl Ethers
作者:Thierry Ollevier、Topwe Mwene-Mbeja
DOI:10.1055/s-2006-950326
日期:2006.12
An efficient bismuth triflate catalyzed [1,3] rearrangement of aryl 3-methylbut-2-enyl ethers has been developed. The reaction proceeds rapidly and affords the corresponding para- and ortho-prenylated phenols and naphthols in moderate to good yields (up to 86%). ortho-Prenylphenols are immediately cyclized under the reaction conditions to the corresponding chroman derivatives.
Allyl aryl ethers undergo accelerated Claisen and [1,3] rearrangements in the presence of a mixture of trialkylalanes and water or aluminoxanes. The ratio of ortho-, meta-, and para-Claisen products depends to a large extent on the presence of water and to a much lesser extent on the nature of the alane.
Dihydrobenzofuran-Derivate als Riech- und/oder Aromastoffe
申请人:Symrise AG
公开号:EP2641903A1
公开(公告)日:2013-09-25
Beschrieben werden insbesondere die Verwendung bestimmter Verbindungen oder Mischungen davon, als Riech- und/oder Aromastoff bzw. als Riechstoff- und/oder Aromastoffmischung, neue Riechstoff- und/oder Aromastoffmischungen, neue parfümierte und/oder aromatisierte Artikel, sowie neue, besonders vorteilhafte erfindungsgemäß zu verwendende Verbindungen und Mischungen.
Feoktistov, V. M.; Bunina-Krivorukova, L. I.; Aleksandrova, E. K., Journal of Organic Chemistry USSR (English Translation), 1984, vol. 20, p. 1977 - 1984
作者:Feoktistov, V. M.、Bunina-Krivorukova, L. I.、Aleksandrova, E. K.