METHOD FOR PRODUCING 3-METHYL-CYCLOPENTADECENONES, METHOD FOR PRODUCING (R)- AND (S)- MUSCONE, AND METHOD FOR PRODUCING OPTICALLY ACTIVE MUSCONE
申请人:Doya Masaharu
公开号:US20110172465A1
公开(公告)日:2011-07-14
By intramolecular condensation reaction of 2,15-hexadecanedione in a gaseous phase with a compound of a Group II element of the Periodic Table as a catalyst, 3-methyl-cyclopentadecenones is generated. Magnesium oxide, calcium oxide, or zinc oxide is desirable as the catalyst for the intramolecular condensation reaction. (R)- and (S)-muscone is generated by subjecting 3-methyl-cyclopentadecenones obtained as above to hydrogenation by using a catalyst. Palladium catalyst is desirable as the hydrogenation catalyst. Optically active muscone is generated by separating 3-methyl-cyclopentadecenones into respective components thereof by means of precision distillation and subsequently subjecting the separated 3-methyl-cyclopentadecenones to asymmetric hydrogenation by using an optically active ruthenium complex catalyst. The production methods described above enable easy and economical production of 3-methyl-cyclopentadecenones, (R)- and (S)-muscone, and optically active muscone.
A Practical Synthesis of (<i>rac</i>)-Muscone and (<i>R</i>)-(–-)-muscone
作者:Chuanjie Cheng、Wei Ding、Shaomin Ding
DOI:10.3184/174751911x12992369451085
日期:2011.4
A practical synthesis of (rac)-muscone in three steps is described, using commercially available 1,10-dibromodecane as the starting material. In the first step, an aldol reaction of 1,10-dibromodecane with ethyl acetoacetate affords the important intermediate 2,15-hexadecanedione in 70% yield. A cyclisation reaction in the second step aided by propyl zinc iodide gives dehydro-muscone in 84% yield.
PROCESS FOR PRODUCTION OF 3-METHYL-CYCLOPENTADECENONE, PROCESS FOR PRODUCTION OF R/S-MUSCONE, AND PROCESS FOR PRODUCTION OF OPTICALLY ACTIVE MUSCONE
申请人:Doya, Masaharu
公开号:EP2412696A1
公开(公告)日:2012-02-01
By intramolecular condensation reaction of 2,15-hexadecanedione in a gaseous phase with a compound of a Group II element of the Periodic Table as a catalyst, 3-methyl-cyclopentadecenones is generated. Magnesium oxide, calcium oxide, or zinc oxide is desirable as the catalyst for the intramolecular condensation reaction. (R)- and (S)-muscone is generated by subjecting 3-methyl-cyclopentadecenones obtained as above to hydrogenation by using a catalyst. Palladium catalyst is desirable as the hydrogenation catalyst. Optically active muscone is generated by separating 3-methyl-cyclopentadecenones into respective components thereof by means of precision distillation and subsequently subjecting the separated 3-methyl-cyclopentadecenones to asymmetric hydrogenation by using an optically active ruthenium complex catalyst. The production methods described above enable easy and economical production of 3-methyl-cyclopentadecenones, (R)-and (S)-muscone, and optically active muscone.