The Reaction of Organoboranes with Lithium Salts of Trisylhydrazones of Cycloalkanones Followed by Treatment with Iodine
作者:Tsutomu Baba、Kamlakar Avasthi、Akira Suzuki
DOI:10.1246/bcsj.56.1571
日期:1983.5
The titled reaction proceeds smoothly under mild conditions to give corresponding 1-alkylcycloalkenes in excellent yields. The overall reaction provides a convenient synthetic procedure of cycloalkenes for cycloalkanones, with various alkyl substituents readily available by means of hydrobortation.
SmI2-mediated reductive cleavage of α-hetero substituents of α-alkyl or α-aryl ketones and lactone gave the corresponding “thermodynamic samarium enolates”. Enantioselective protonation of the samarium enolates with C2-symmetric chiral diols afforded the corresponding ketones and lactone in moderate to high enantioselectivities.
The present application relates to perfume systems and consumer products comprising new perfumes and/or such perfume systems, as well as processes for making and using such perfume systems and consumer products.
The present invention relates to compounds useful as fragrance ingredients of formula (I)
wherein
the bond between C-1 and C-2 is a single bond and the dotted line together with the bond between C-2 and C-3 represents a double bond; or
the bond between C-2 and C-3 is a single bond and the dotted line together with the bond between C-1 and C-2 represents a double bond.
The present invention relates to 1-(2-isobutylcyclohex-1-enyl)but-2-en-1-one and 1-(2-isobutylcyclohex-2-enyl)but-2-en-1-one and their use as fragrance ingredient.