PROCESS FOR PREPARING KETONES, IN PARTICULAR MACROCYCLIC KETONES
申请人:Schelper Michael
公开号:US20120088935A1
公开(公告)日:2012-04-12
Ketones of the formula II
where A is optionally alkyl-substituted C
2
-C
12
-alkanediyl, R
1
and R
2
are each, independently of one another, C
1
-C
6
-alkyl, or R
1
and R
2
together form optionally alkyl-substituted C
3
-C
10
-alkanediyl, and R
3
is hydrogen or C
1
-C
6
-alkyl, are prepared by reacting a cyclic olefin of the formula I
with dinitrogen monoxide to form the ketone of the formula II. The ketone of the formula II can be further hydrogenated to form the saturated ketone of the formula III.
Macrocyclic ketones of the formula III, e.g. muscone, are sought after as fragrances.
Cyclopropylcarbinyl radicals as three-carbon insertion units: easy synthesis of C-15 macrocyclic ketones by three-carbon ring expansion
作者:Georg Rüedi、Hans-Jürgen Hansen
DOI:10.1016/j.tetlet.2004.04.148
日期:2004.6
isomerization of cyclic 3-cyclopropyl ketones under FVP conditions at 620 °C provides a new and convenient route to δ,ε-unsaturated cycloalkanones. The synthetic potential of this novel three-carbonringexpansion has been demonstrated by the synthesis of (±)-muscone from inexpensive C-12 starting material.