Zobrazeno 1 - 10
of 17
pro vyhledávání: '"M. L. A. A. Vasconcellos"'
Publikováno v:
Synthesis. 2004:1767-1770
We describe the first example of a chemoselective oxidation of phenyl and p-methoxyphenyl groups to carboxylic acid functions in the presence of a tetrahydropyran ring, using 0.02 mol% of RuCl 3 and a co-oxidant. The use of NaIO 4 as co-oxidant in H
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc4b67fb502b24748fbe6ca378d53889
https://doi.org/10.1055/s-2004-829119
https://doi.org/10.1055/s-2004-829119
Autor:
Marcelo Cardoso Branco, Maria Teresa do Prado Gambardella, Uendel G. Barreiros, M. L. A. A. Vasconcellos, Oduvaldo F Ramos, Marcelo B. Ribeiro, Mauro L. Mellão
Publikováno v:
Synthetic Communications. 28:4077-4085
New alcohols 3d, 3e and 3f were efficiently prepared in enantiopure form (2 steps, 50–58%), from available 1-(R)-(+)-camphor 1. The absolute configurations were assigned by NMR and relative X-ray crystallographic analysis.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8fdddbe4867b1bd43a9a930465f778f0
https://doi.org/10.1080/00397919808004968
https://doi.org/10.1080/00397919808004968
Autor:
Paulo R. R. Costa, Maria J.L. Barbero, Karla G. Alencar, Christine Miet, Flavien Gérard, Françoise Dumas, M. L. A. A. Vasconcellos, Jacqueline Mahuteau
Publikováno v:
Tetrahedron: Asymmetry. 8:579-583
New chiral auxiliaries, alcohols syn- 11 a,e and anti- 12 a,e were readily synthesized in a stereoselective manner from (−)-β-pinene. Their stereochemical determinations have been made on the basis of nOe experiments.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd6d7214040d9b741bd7fd2f9c723154
https://doi.org/10.1016/s0957-4166(96)00523-x
https://doi.org/10.1016/s0957-4166(96)00523-x
Publikováno v:
Synthetic Communications. 26:3671-3676
An Etodolac analogue, (-)-7, was prepared in 40% ee. by asymmetric Friedel-Crafts reaction, involving tryptophol 4 and chiral β-ketobutyrate 5f, followed by hydrolysis.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6da2896586add3c5c0162e3d2e4576e
https://doi.org/10.1080/00397919608003781
https://doi.org/10.1080/00397919608003781
Publikováno v:
Tetrahedron: Asymmetry. 7:1607-1610
New 1,3 diols 3a→3c were efficiently prepared in the enantiopure form in 50–68% yield (2 steps), from the available 1-(R)-(+)-camphor 1.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad9315b919585691a8a98505c2a566a5
https://doi.org/10.1016/0957-4166(96)00194-2
https://doi.org/10.1016/0957-4166(96)00194-2
Publikováno v:
ChemInform. 24
trans-2-Aryclohexanols 2a, 2b proved to be efficient auxiliaries esters in the Mukaiyama aldol-type condensation of silyl enol esters 4 with aldehydes.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf9d35df6c69c73c34e362188cfcd460
https://doi.org/10.1002/chin.199301085
https://doi.org/10.1002/chin.199301085
Autor:
M. L. A. A. Vasconcellos, Jaime A. Rabi, Paulo R. R. Costa, Antonio L. Coelho, Alessandro B. C. Simas
Publikováno v:
ChemInform. 24
Coupling of 7-methoxy-8-(3-methyl-2-butenyl)-2H-1-benzopyran (4 a) with 2-chloromercurio-4,5-methylenedioxyphenol (5) yields (±)-6 a,12 a-cis-dihydro-3-methoxy-4-(3-methyl-2-butenyl)-6H-[1,3] dioxolo[5,6]benzofuro[3,2-c][1]benzopyran (6; ±-4-prenyl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::036d4a33a00f2bc3991f7bb70a706045
https://doi.org/10.1002/chin.199307202
https://doi.org/10.1002/chin.199307202
Autor:
Pinheiro. S. Pinheiro. S., Paulo R. R. Costa, H. C. A. Filho, M. L. A. A. Vasconcellos, Ubiracir F.L. Filho
Publikováno v:
ChemInform. 25
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cae9ac9b13f6444106d23676b294c8da
https://doi.org/10.1002/chin.199450255
https://doi.org/10.1002/chin.199450255
Publikováno v:
ChemInform. 27
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc7985ff38102a589d590d200c3f8407
https://doi.org/10.1002/chin.199650070
https://doi.org/10.1002/chin.199650070
Publikováno v:
ChemInform. 27
New 1,3 diols 3a→3c were efficiently prepared in the enantiopure form in 50–68% yield (2 steps), from the available 1-(R)-(+)-camphor 1.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7da87c90d1bc899d1b86dfea93486bb6
https://doi.org/10.1002/chin.199640176
https://doi.org/10.1002/chin.199640176