Synthese und Reaktionen von ?-Campholenverbindungen
摘要:
In contrast to the well known alpha-campholenic (B) and fencholenic compounds (C) little is known about beta-campholenic derivatives (A) because of their difficult accessibilitiy. Beta-campholenic compounds (A) can be obtained: (1) by Baeyer-Villiger oxidation of camphor via lactone 7 and beta-dihydrocampholenic lactone (5); (2) by Beckmann fragmentation of camphor oxime via alpha-(2) and beta-campholenic nitril (3) and the lactone 5; and (3) by acid catalysed rearrangement of alpha-campholenic derivatives (B, 17a, b). The beta-analogous brahmanol (14) can be synthesized by the reaction of the beta-campholenic bromide (11) with methyl diethyl malonate or by rearrangement of brahmanol.
[EN] HYDROGENATION OF ESTERS OR CARBONYL GROUPS WITH TETRADENTATE AMINO/IMINO-THIOETHER BASED RUTHENIUM COMPLEXES [FR] HYDROGÉNATION DE GROUPES ESTERS OU CARBONYLES AVEC DES COMPLEXES DU RUTHÉNIUM À BASE D'AMINO/IMINO-THIOÉTHER TÉTRADENTATE
HYDROGENATION OF ESTERS OR CARBONYL GROUPS WITH TETRADENTATE AMINO/IMINO-THIOETHER BASED RUTHENIUM COMPLEXES
申请人:Saudan Sylvia Joyeuse Adélaïde Ada
公开号:US20130274487A1
公开(公告)日:2013-10-17
The present invention relates to the field of catalytic hydrogenation and, more particularly, to the use of specific ruthenium catalysts, or pre-catalysts, in hydrogenation processes for the reduction of ketones and/or aldehydes into the corresponding alcohol respectively. Said catalysts are ruthenium complexes comprising a tetradentate ligand (L4) coordinating the ruthenium with: two nitrogen atoms, each in the form of a primary or secondary amine (i.e. a NH
2
or NH group) or N-alkyl imine functional groups (i.e. a C═N group), and two sulfur atoms, each in the form of thioether functional groups.
The object of the present invention resides in efficiently providing unsaturated alcohol from an .alpha.,.beta.-unsaturated aldehyde. The present invention provides a process for preparing unsaturated alcohol by selectively reducing the aldehyde group of an .alpha.,.beta.-unsaturated aldehyde in the presence of a primary or a secondary alcohol having 2 to 8 carbon atoms using an aluminum alcoholate to produce an unsaturated alcohol such as compounds represented by the formula (III). ##STR1## (wherein R represents an alkyl group having 1 to 3 carbon atoms) wherein the reaction is carried out with addition of a protonic acid.
3-(2-Alkoxycarbonyloxy-Phenyl) Acrylic Acid Esters And Their Use As Precursors For The Delivery Of Olfactory Compounds
申请人:Flachsmann Felix
公开号:US20080269102A1
公开(公告)日:2008-10-30
A compound of formula (I), their use as precursors and a method of their production
wherein n, Y, R, R
2
, R
3
, and R
4
has the same meaning as given in the specification.
3-(2-Alkoxycarbonyloxy-Phenyl) Acrylic Acid Esters and Their Use as Precursors for the Delivery of Olfactory Compounds
申请人:FLACHSMANN Felix
公开号:US20100137627A1
公开(公告)日:2010-06-03
A compound of formula (I), their use as precursors and a method of their production
wherein n, Y, R, R
2
, R
3
, and R
4
has the same meaning as given in the specification.
Thermal Nickel-Catalyzed Carbon–Oxygen Cross-Coupling of (Hetero)aryl Halides with Alcohols Enabled by the Use of a Silane Reductant Approach
作者:Liu Yang、Hai-Juan Jiao、Geyang Song、Yan-Ru Huang、Nan Ji、Dong Xue、Wei He
DOI:10.1021/acscatal.4c01283
日期:2024.5.17
cross-coupling of aryl halides with primary and secondary alcohols, without the need for photo- or electrocatalysis. The protocol is simple and has a wide substrate scope, particularly for challenging electron-rich aryl halides. Additionally, this methodology has been successfully applied to the late-stage functionalization of drugs and natural products, as well as the synthesis of pharmaceuticals such