acids mediated by hypervalentiodine(III) reagents is described. The decarboxylative C–O bond forming reaction proceeded in the presence of PhI(OAc)2 to give the corresponding allylic acetates. In addition, decarboxylative C–N bond formation was achieved by utilizing hypervalentiodine(III) reagents containing an I–N bond. Mechanistic studies suggest the unique reactivity of hypervalentiodine reagents
Organoleptic Compounds and Their Use in Perfume Compositions
申请人:Narula Anubhav P.S.
公开号:US20080064624A1
公开(公告)日:2008-03-13
The present invention is directed to the novel cyclohexyl, cyclopentyl and acyclic ester compounds of the general formula:
wherein R and R
1
independently represent a hydrogen or a straight, branched or cyclic hydrocarbon consisting of less than 15, preferably less than 10, most preferably less than 4 carbon atoms and contain one or more double bonds.
nucleosides via Sharpless asymmetricdihydroxylation of N-allylpyrimidines or N-alkenylpurines is reported. A range of chiral acyclic nucleosides with two adjacent hydroxyl groups present on the side chains could be produced in good yields (up to 97% yield) and excellent enantioselectivities (90–99% ee). The synthetic utility of the reaction was demonstrated by the catalytic asymmetric synthesis of (S)-Cidofovir
The methyl malonate esters of 3-buten-1-ol and 2-methyl-3-buten-1-ol can be coupled efficiently to different methallylic esters in the presence of the second-generation Grubbs catalyst to yield trisubstituted olefins by the cross-metathesis reaction. Product selectivity and yields depend on the relative amounts of reagents and to a minor extent on the methallylic ester functional group. Alkyl substituents