A Convenient and Asymmetric Protocol for the Synthesis of Natural Products Containing Chiral Alkyl Chains via Zr-Catalyzed Asymmetric Carboalumination of Alkenes. Synthesis of Phytol and Vitamins E and K
摘要:
[GRAPHICS]A convenient and asymmetric protocol for the synthesis of chiral oligoisoprenoids is described. Typically, a C-14 vitamin E side chain 5 was synthesized in 47% yield over four steps. Isomeric purity of 5 was upgraded to > 99% R at C-2 and 97% R at C-6 by the statistical formation of stereoisomeric p-phenylenebisurethanes and their diastereomeric separation. In addition, phytol and vitamin K were synthesized in 21% and 28% overall yields, respectively, over five steps from 1.
Chemoselective Tertiary C−H Hydroxylation for Late‐Stage Functionalization with Mn(PDP)/Chloroacetic Acid Catalysis
作者:Rachel K. Chambers、Jinpeng Zhao、Connor P. Delaney、M. Christina White
DOI:10.1002/adsc.201901472
日期:2020.1.23
oxidizing remote tertiary C(sp3)-Hbonds in the presence of a broad range of aromatic and heterocyclic moieties. Although catalyst loadings can be lowered to 0.1 mol% under a Mn(PDP)/acetic acid system for aromatic and non-basic nitrogen heterocycle substrates, the Mn(PDP)/chloroacetic acid system generally affords 10-15% higher isolated yields on these substrates and is uniquely effective for remote C(sp
[EN] ESTERS AND ETHERS OF 2,2,4,4-TETRAMETHYLCYCLOBUTANE-1,3-DIOL FOR USE AS AROMA CHEMICALS<br/>[FR] ESTERS ET ÉTHERS DE 2,2,4,4-TÉTRAMÉTHYLCYCLOBUTANE -1,3-DIOL DESTINÉS À ÊTRE UTILISÉS EN TANT QUE PRODUITS CHIMIQUES AROMATIQUES
申请人:BASF SE
公开号:WO2019048544A1
公开(公告)日:2019-03-14
The present invention relates to the use of a compound of the general formula (I) wherein R1 is C1-C4-alkyl or -(C=0)-R3, R2 is hydrogen, C1-C4-alkyl or -(C=0)-R4, and R3 and R4, independently of one another, are selected from the group consisting of hydrogen and C1-C4-alkyl, a stereoisomer thereof or a mixture of stereoisomers thereof, as an aroma chemical, to aroma chemical compositions comprising at least one compound of the general formula (I), a stereoisomer thereof or a mixture of stereoisomers thereof, and to a method for preparing a fragranced ready-to-use composition, which comprises incorporating at least one compound of the general formula (I), a stereoisomer thereof or a mixture of stereoisomers thereof, into a ready- to-use composition. The present invention further relates to specific ethers and specific esters of the compounds of the general formula (I) and a method for their preparation.
The invention relates to mixtures having:
components (a) having at least one fragrance of the formula (I)
where
R1=OC-R2, CH
2
OR3, C1-C8 open-chain or branched aliphatic radical, optionally substituted and/or unsaturated,
with R2=an open-chain or branched aliphatic radical, optionally substituted and/or unsaturated, having 2-10 C atoms,
with R3=an open-chain or branched aliphatic radical, optionally substituted and/or unsaturated, having 1-8 C atoms, and
components (b) having at least one fragrance, different from the fragrances of component a,
characterized in that the weight ratio of all components (a) to all components (b) is from 1:10 to 1:10000.
The instant invention relates to a combination of an alpha-2-delta ligand and an AChE inhibitor for use in therapy, particularly in the treatment of pain, particularly neuropathic pain. Particularly preferred alpha-2-delta ligands are gabapentin and pregabalin. Particularly preferred ACHE inhibitors are donepezil (Aricept®), tacrine (cognex®), rivastigmine (Exelon®), physostgmine (Synapton®), galantamine (Reminyl), metrifonate (Promem), neostigmine (Prostigmin) and icopezil.
[EN] HIGH-COVERAGE, LOW ODOR MALODOR COUNTERACTANT COMPOUNDS AND METHODS OF USE<br/>[FR] COMPOSÉS AGISSANT CONTRE LES MAUVAISES ODEURS, À FAIBLE ODEUR ET À POUVOIR COUVRANT ÉLEVÉ, ET PROCÉDÉS D'UTILISATION
申请人:INT FLAVORS & FRAGRANCES INC
公开号:WO2016049523A1
公开(公告)日:2016-03-31
The present invention relates to novel compounds and their use as malodor counteractant materials.