Zobrazeno 1 - 10
of 170
pro vyhledávání: '"J.‐C. Jacquesy"'
Publikováno v:
Tetrahedron. 58:6643-6649
Reaction of cyclic ketones 2 – 6 and imines 15 – 17 in HF/SbF 5 in presence of CCl 4 yield hydroxy or fluoroderivatives, hydride abstraction occurring at a site located far from the functional group. Whereas ketones 2 – 5 yield only hydroxy der
Publikováno v:
Tetrahedron Letters. 37:7731-7734
In HF/SbF5/CCln4 bicyclic cyclohexanones are dehydrogenated to enones and dienones, superelectrophilic trichloromethyl cation CCl3+ reacting as a strong hydride acceptor. Dehydrogenation is also observed with steroidal enones.
Publikováno v:
Tetrahedron Letters. 37:7735-7738
Nucleophilic para-fluorination of (R,S)-1,1′-Bi-5,6,7,8-tetrahydro-2-naphthol (and its monoacetate) with C6H5J(OCOCF3)2− pyridinium polyhydrogen fluoride yields atropoisomeric fluorocyclohexadienones.
Publikováno v:
Tetrahedron Letters. 35:2541-2544
Ipso-fluorination of 4-alkylphenols with C 6 H 5 -I(OCOCF 3 ) 2 -pyridinium polyhydrogen fluoride (PPHF) yields 4—fluorocyclohexa-2,5-dienones.
Publikováno v:
Tetrahedron. 50:1165-1172
Starting from (S)-propylene oxide, the protected C-3 homolog of 4-deoxy daunosamine 11 is prepared in 4 steps. Acid catalyzed glycosidation of anthracyclinones such as daunomycinone, β-rhodomycinone and e-isorhodomycinone with 11 affords new analogs
Publikováno v:
Scopus-Elsevier
Publikováno v:
Tetrahedron Letters. 34:2949-2952
Selective chlorination of 4-alkylphenols ethers with SbF5/CH2Cl2 (CHCl3, CCl4) yields 4-chlorocyclohexa-2,5-dienones; no α-chlorination to a carbonyl group is observed in the reaction conditions.
Publikováno v:
ChemInform. 23
Publikováno v:
ChemInform. 23
A new efficient synthesis of L-fucose (and 6-alkyl analogs) in only six steps from D-mannose is described. This transfromation is based on addition of an organometallic reagent to the bis-acetonide of D-mannose followed by selective glycol cleavage w
Publikováno v:
ChemInform. 22