摘要:
The present invention relates to a process of manufacturing (6R,10R)-6,10,14-trimetylpentadecan-2-one in a multistep synthesis from a mixture of E/Z isomers of (R)-6,10,14-trimetylpentadec-5-en-2-one. The process is very advantageous in that it forms in an efficient way the desired chiral product from a mixture of stereoisomers of the starting product.
摘要:
The present invention relates to a process of manufacturing (6R,10R)- 6,10,14-trimetylpentadecan-2-one in a multistep synthesis from a mixture of (5E,9E)-, (5E,9Z)-, (5Z,9E)- and (5Z.9Z)- isomers of 6, 10, 14-trimetylpentadeca- 5,9,13-trien-2-one or 6,10,14-trimetylpentadeca-5,9-dien-2-one. The process is very advantageous in that it forms in an efficient way the desired chiral product from a mixture of stereoisomers of the starting product.
摘要:
The present invention provides a new process for producing an oxazole compound of formula (I), which can avoid toxic and corrosive reagent, and salts by-products and has high efficiency,formula (I). Wherein R is H, or lower alkyl or aryl optionally substituted by one or more substituents.
摘要:
The present invention relates to a process of manufacturing (6R,10R)-6,10,14-trimetylpentadecan-2-one in a multistep synthesis from 3,7-dimetyloct-2-enal or 3,7-dimetylocta-2,6-dienal. The process is very advantageous in that it forms the desired chiral product from a mixture of stereoisomers of the starting product in an efficient way.
摘要:
The present invention relates to novel compounds which are particularly useful for the synthesis of novel chromanol derivatives. These compounds have interesting properties. Particularly, the novel chromanol derivatives have interesting antioxidant properties as well as flavours and fragrances.
摘要:
The present invention relates to a process of manufacturing compound having stereogenic centres from a mixture of E/Z isomers of unsaturated compounds having prochiral double bonds. The hydrogenation product has a specific desired configuration at the stereogenic centres. The process involves an asymmetric hydrogenation and an isomerization step. The process is very advantageous in that it forms the desired chiral product from a mixture of stereoisomers of the starting product in an efficient way.
摘要:
The present invention relates to a process of manufacturing (6R,10R)-6,10,14-trimetylpentadecan-2-one in a multistep synthesis from 6,10-dimetylundec-5-en-2-one or 6,10-dimetylundeca-5,9-dien-2-one. The process is very advantageous in that it forms in an efficient way the desired chiral product from a mixture of stereoisomers of the starting product.
摘要:
The present invention relates to the manufacturing of a process of alkyl 2- acetyl-5,9,13-trimethyltetradeca-4,8,12-trienoates and alkyl 2-acetyl-9,13-di- methyl-5-methylenetetradeca-8,12-dienoate as well as 6,10,14-trimethylpenta- deca-5,9,13-trien-2-one and 10,14-dimethyl-6-methylenepentadeca-9,13-dien-2-5 one and 6,10,14-trimethylpentadecan-2-one.
摘要:
The present invention relates to the method of preparing chiral chromanes and chromenes in high yields by intramolecular hydroarylation of chiral aryl alkynes catalysed by either a silver(I) or gold(I) salt or complex in combination of a specific acid or by a silver(I) or gold(I) metal salt or complex having specific anion. By the hydroarylation a chromene is formed which has a chiral centre in the 2 position. The corresponding chromane is obtained by hydrogenation of the chromenes.
摘要:
The present invention relates to a process of manufacturing compound having stereogenic centres from a mixture of E/Z isomers of unsaturated compounds having prochiral double bonds. The hydrogenation product has a specific desired configuration at the stereogenic centres. The process involves two asymmetric hydrogenation steps. The process is very advantageous in that it forms the desired chiral product from a mixture of stereoisomers of the starting product in an efficient way.