Zobrazeno 1 - 10
of 161
pro vyhledávání: '"Carlo Rosini"'
Publikováno v:
ARKIVOC, Vol 2008, Iss 8, Pp 116-125 (2008)
Externí odkaz:
https://doaj.org/article/bbabc7d7c6244048b179847a2c2a9399
Publikováno v:
Tetrahedron. 68:5779-5784
A versatile and straightforward approach to optically active cis -4,5-disubstituted γ- and δ-lactones by catalytic enantioselective addition of dialkyzincs to cinnamic aldehydes and RCM ring closure has been reported. The synthetic importance of th
Publikováno v:
Tetrahedron: Asymmetry. 22:558-561
Herein we report the asymmetric addition of phenylboronic acid to different cycloalkenones, mediated by a Rh(I) complex with the tropos phosphoramidite ( S )- L 1 or the nontropos phosphoramidite ( S )- L 2 ligand. Different values of enantiomeric pu
Publikováno v:
The Journal of Organic Chemistry. 75:4600-4603
In ab initio calculation of ORs of flexible molecules, the input geometries and conformer populations obtained at different levels of theory can yield opposite OR values. Therefore, when at the commonly used DFT/B3LYP/6-31G* level several conformers
Publikováno v:
Chirality. 21:176-182
A new simple route to (+)-cis-2-methyl-4-propyl-1,3-oxathiane, the main component responsible of the passion fruit aroma is shown. Such a procedure consists in the sequence of the asymmetric conjugated addition of a thiol to trans-2-hexenal/cleavage
Publikováno v:
The Journal of Organic Chemistry. 73:4865-4873
By reacting flexible and optically transparent in UV-vis molecules such as 1,2-, syn- and anti-1,3-diols, 1,3-sulfanylalcohols of known absolute configuration (AC) with fluorenone dimethyl acetal, the corresponding ketals are obtained. They are confo
Publikováno v:
Chirality. 20:592-596
The effects of the substitution on the aryl moiety on the asymmetric oxidation of sulfides mediated by Ti-complexes of chiral 1,2-diarylethane-1,2-diols were investigated. The substitution of the aryl ring of the diol with both EWG and EDG substituen
Publikováno v:
The Journal of Organic Chemistry. 72:6680-6691
The optical rotatory power of some natural cyclohexene oxides, such as (+)-chaloxone, 1, (+)-epiepoformine, 2, (+)-epoformine, 3, (+)-epoxidone, 5, (-)-sphaeropsidone, 6, (-)-episphaeropsidone, 7, and the synthetic compound (+)-epitheobroxide, 4, has
Autor:
Luisella Verotta, Nina Berova, Koji Nakanishi, Katsunori Tanaka, Egidio Giorgio, Carlo Rosini
Publikováno v:
Chirality. 19:434-445
The paper describes the synthesis and chiroptical properties of (−)-1,2,3,3a,8,8a,-hexahydro-1,3a-dimethyl-pyrrolo[2,3-b]indole, (−)-1, one of the monomeric units of many flexible polypyrroloindoline alkaloids and (−)-chimonanthine, (−)-2. Th
Publikováno v:
Tetrahedron: Asymmetry. 17:2511-2515
We show herein an alternative catalytic, highly enantioselective approach to ( R )-12-methyltridecanolide and ( S )-muscolide, that is, chiral macrocyclic lactones which are good musk odorants. In fact, they can be efficiently prepared by a sequence