Cyclization of 1,5-Dienes: An Efficient Synthesis of β-Georgywood
摘要:
In the acid-promoted 1,5-diene cyclization of pseudo- to beta-Georgywood, the cyclization product is obtained with high selectivity in spite of an unfavorable substituent at the C(2)-position of the diene precursor. Preisomerization of the cyclohexene double bond, which occurs in the presence of Bronsted acids, is suppressed with > 1 equiv of MXn-type Lewis acids, whereas RAlX2-type Lewis acids such as > 2 equiv of MeAlCl2 have the additional benefit of steering the double bond of the cyclized product into the desired beta-position. Mechanistic studies revealed a crucial participation or nonparticipation of the carbonyl group in the cyclization reaction, depending on the acid family employed, and allowed finally the development of a cyclization reaction catalyzed by MeAlCl2 that can be generated in situ from precatalyst AlMe3.(1).
The present invention concerns a composition of matter comprising at least 85% w/w of (Z)-4,8-dimethyl-2,7-nonadien-4-ol and at most 15% w/w of (E)-4,8-dimethyl-2,7-nonadien-4-ol, as well as the use as perfuming ingredient of said composition of matter.
The present invention concerns a composition of matter comprising at least 85% w/w of (Z)-4,8-dimethyl-2,7-nonadien-4-ol and at most 15% w/w of (E)-4,8-dimethyl-2,7-nonadien-4-ol, as well as the use as perfuming ingredient of said composition of matter.
STORK, G.;BAINE, N. H., J. AMER. CHEM. SOC., 1982, 104, N 8, 2321-2323
作者:STORK, G.、BAINE, N. H.
DOI:——
日期:——
US9284513B2
申请人:——
公开号:US9284513B2
公开(公告)日:2016-03-15
[EN] SAGE ODORANT<br/>[FR] PARFUM DE SAUGE
申请人:FIRMENICH & CIE
公开号:WO2014095321A1
公开(公告)日:2014-06-26
The present invention concerns a composition of matter comprising at least 85% w/w of (Z)-4,8-dimethyl-2,7-nonadien-4-ol and at most 15% w/w of (E)-4,8-dimethyl-2,7-nonadien-4-ol, as well as the use as perfuming ingredient of said composition of matter.