Free radical-promoted, one-carbon, ring expansion of twelve, fourteen-, and fifteen-membered cyclic β-keto esters is described. The method is then extended to include a three-carbon ring expansion of cyclododecanone, the targets being (±)-muscone and naturally occurring (R)-(−)muscone.
Free radical ring expansion and rearrangement of large carbocyclic rings
作者:Paul Dowd、Soo-Chang Choi
DOI:10.1016/s0040-4039(00)74828-3
日期:1991.1
Free radical initiated ringexpansion of twelve-, thirtheen-, and fourteen-membered carbocyclicrings is described together with a new synthesis of (R)-(−)-muscone.
The present invention relates to novel macrocyclic lactones, to processes for their preparation and to their use as fragrances and also to products comprising the novel macrocyclic lactones.
本发明涉及新型大环内酯、其制备方法以及作为香料的用途,还涉及包含新型大环内酯的产品。
PROCESS FOR THE PREPARATION OF CYCLIC ENOL ETHERS
申请人:Ebel Klaus
公开号:US20130005994A1
公开(公告)日:2013-01-03
The present invention relates to a process for the preparation of cyclic enol ethers.
本发明涉及一种制备环烯醇醚的方法。
A Novel Three-Carbon Ring Expansion Sequence Synthesis of<i>Exaltone</i>® and (±)-Muscone
作者:Charles Fehr
DOI:10.1002/hlca.19830660816
日期:1983.12.14
Intramolecular Grignard-type reaction of the bromo lactones 3 and 8 affords the macrocycles 10, 11, 12 and 13, 14, 15, respectively. More efficiently, 10 and 13 are obtained by intramolecular nucleophilic attack of the carbanions derived from the sulfonyl lactones 20 and 22 and in situ reduction of the intermediate sulfones 21 and 23. The macrocylic hydroxy ketones 10 and 13 are converted into Exaltone®