Enantioselectivebromolactonization of trisubstituted olefinicacids producing synthetically useful chiral lactones with two contiguous asymmetric centers has remained mainly unexplored except for the 6‐exo cyclization mode. In this work, the 5‐exo‐ and 6‐endo modes of bromocyclization of trisubstituted olefinicacids were enabled for the first time using N‐bromosuccinimide and a pyridyl phosphoramide
PERFUMING INGREDIENTS OF THE FLORAL AND/OR ANIS TYPE
申请人:FIRMENICH SA
公开号:US20140314699A1
公开(公告)日:2014-10-23
The present invention concerns a compound of formula
wherein R represents a hydrogen atom or a C
1-2
alkyl or alkoxyl group;
each R
1
, R
2
or R
3
represents a hydrogen atom or a methyl or ethyl group; and
X represents a CHO, COOR
4
or CN group, R
4
being a methyl or ethyl group; and
at least one of said R, R
1
or R
2
represents a group containing at least one carbon atom;
and it use as perfuming ingredient, for instance to impart odor notes of the floral and/or anis type.