Diradical-Promoted (<i>n </i>+ 2 − 1) Ring Expansion: An Efficient Reaction for the Synthesis of Macrocyclic Ketones
作者:Georg Rüedi、Matthias A. Oberli、Matthias Nagel、Hans-Jürgen Hansen
DOI:10.1021/ol048701e
日期:2004.9.1
[reaction: see text] A diradical-promoted (n + 2 - 1) ringexpansionreaction based on vinyl side chain insertion (+2C) and decarbonylation (-1C) has been developed. Flash vacuum pyrolysis (FVP) of medium- and large-ring 2-trimethylsilyloxy-2-vinyl-cycloalkanones at 500-600 degrees C affords the one-carbon ring-expanded cycloalkanones in good yields. Methyl groups on the vinyl moiety are transformed
[EN] SYNTHESIS OF 14-METHYL-16-OXABICYCLO[10.3.1]HEXADEC-12-ENE<br/>[FR] SYNTHÈSE DE 14-MÉTHYL-16-OXABICYCLO [10.3.1] HEXADÉC-12-ÈNE
申请人:INT FLAVORS & FRAGRANCES INC
公开号:WO2020150454A1
公开(公告)日:2020-07-23
Disclosed is a scalable process for preparation of 14-methyl-16-oxabicyclo[10.3.1]hexadec-12-ene (BCE), a key intermediate for manufacture of fragrance ingredient 3-methylcyclopentadecenone (MUSCENONE®) and analogs through reaction of 3-Methyl-1,5-cyclopentadecanedione (MCPD) and analogs with a metal or metalloid alkoxide in high yield and purity.