A catalytic asymmetricsynthesis of the keyintermediates 4 and 15 for the capnellenols has been achieved through an asymmetric Heck reaction followed by the acetate anion capture process. Furthermore, the above reaction has been successfully applied to an asymmetric Heck reaction -amine capture process.
La cyclisation aldol d'un cetoester derive du bicyclo [3.3.0] octane, induite par TMSO Tf/Et 3 N conduit au squelette du capnellane
La 环化 aldol d'un cetoester 衍生 du bicyclo [3.3.0] 辛烷,induite par TMSO Tf/Et 3 N 导管 au scelette du capnellane
.beta.-Ketocarboxyl and phosphonate dihydro-chalcone sweeteners
申请人:The United States of America as represented by the Secretary of the
公开号:US04348333A1
公开(公告)日:1982-09-07
Dihydrochalcones of the formula ##STR1## are disclosed wherein M.sup.+ is a physiologically acceptable cation, X is H or OH, R is a lower alkyl and R' is ##STR2## and n and q, respectively, may have a numerical value of 1 to 6. These materials are useful as sweeteners for edibles.