[EN] PROCESS FOR THE PREPARATION OF BETA-SANTALOL<br/>[FR] PROCÉDÉ DE PRÉPARATION DU BÊTA-SANTALOL
申请人:FIRMENICH & CIE
公开号:WO2013001026A1
公开(公告)日:2013-01-03
The present invention concerns a process for the preparation of a compound of formula (I) in the form of any one of its stereoisomers or mixtures thereof, and wherein R represents a C2-C10 group of formula CORa wherein Ra is an alkyl or alkenyl group optionally comprising one or two ether functional groups or is a phenyl or benzyl group optionally substituted by one to three alkyl, alkoxyl, carboxyl, acyl, amino or nitro groups or halogen atoms. The invention concerns also the use of compound (I) for the synthesis of β-santalol or of derivatives thereof.
Altering the Allowed/Forbidden Gap in Cyclobutene Electrocyclic Reactions: Experimental and Theoretical Evaluations of the Effect of Planarity Constraints
作者:Patrick S. Lee、Shogo Sakai、Peter Hörstermann、Wolfgang R. Roth、E. Adam Kallel、K. N. Houk
DOI:10.1021/ja028963g
日期:2003.5.1
the forbidden disrotatory pathways decreases. For the ring-opening of a cyclobutene fused to norbornene, the energy gap between the forbidden and the allowed transition state is only 4.1 kcal/mol by CASSCF and 8.0 kcal/mol by CAS-MP2 as compared to 13.4 and 19.2 kcal/mol, respectively, for the parent cyclobutene. Experimentalstudies of 3,4-dimethylcyclobutenes fused to various ring systems are reported
A Concise Synthesis of
<i>rac</i>
‐
<i>Ambrox</i>
®
<i>via</i>
the Palladium(0)‐Catalyzed Carboalkoxylation of an Allylic Ammonium Salt, as Compared to a Formaldehyde Hetero
<i>Diels–Alder</i>
Approach
作者:Christian Chapuis、David Skuy、Claude‐Alain Richard
DOI:10.1002/hlca.201900097
日期:2019.7
followed by a 1.5 mol‐% Pd‐catalyzed carbomethoxylation of quaternized 31b, leads to the methyl ester 36a. This latter could also be obtained in optically pure form by carbomethoxylation of the corresponding (+)‐acetate. Final reduction‐cyclization may be conducted as earlier described, towards the desired odoriferous rac‐Ambrox® 38a, or its pure (−)‐enantiomer. Generation of a π‐allyl Pd complex from an allylic
The present invention concerns compounds of formula (I) in the form of any one of its stereoisomers or a mixture thereof, and wherein one dotted line represents a carbon-carbon single or double bond and the others a carbon-carbon single bond; each R, independently from each other, represents a hydrogen atom or a methyl or ethyl group provided that at least one of said R groups represents a methyl or ethyl group; and R1 represents a methyl or ethyl group; and their use in perfumery to impart odor notes of the woody type having cedar, ambery, patchouli and/or rooty aspect.
Synthesis and structural characterization of a novel pair of rigid diastereomeric triads
作者:James M. Lawson、Donald C. Craig、Anna M. Oliver、Michael N. Paddon-Row
DOI:10.1016/0040-4020(95)00107-j
日期:1995.3
A method is described for constructing totally rigid triad (nichromophoric) systems, D2-B1-D1-B2-A, in which the chromophores D2 (= dimethylaniline), D1 (= 1,4-dimethoxynaphthalene), and A (= dicyanovinyl) are fused to rigid hydrocarbon bridges, B1 and B2, comprising linearly fused norbornane and bicyclo[2.2.0]hexane units.