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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Reações aldolicas entre enolatos de boro de metilcetonas e aldeidos aquirais e alfa-aminoaldeidos / Aldol reactions of boron enolates of methylketones with achiral aldehydes and alpha-amino aldehydes

Oliveira, Vanda Maria de 05 September 2008 (has links)
Orientador: Luiz Carlos Dias / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica / Made available in DSpace on 2018-08-12T09:34:22Z (GMT). No. of bitstreams: 1 Oliveira_VandaMariade_M.pdf: 2580285 bytes, checksum: 691d41628333efc92e279be76c7dd14c (MD5) Previous issue date: 2008 / Resumo: O capítulo 1 descreve as reações aldólicas de enolatos de boro de metilcetonas quirais com aldeídos aquirais. Neste trabalho relatamos resultados que sugerem a competição entre a estereoindução 1,4/1,5 na construção da ligação C-C dos adutos de aldol. Os produtos foram obtidos com seletividades que variam de 50:50 a 70:30, e em rendimentos que variaram de 82-95%. O capitulo 2 descreve as reações aldólicas de enolatos de boro de metilcetonas com a-aminoaldeidos para a síntese estereosseletiva de 3-hidroxi-4-aminocetonas. Estas reações forneceram os adutos de aldol com estereoquímica relativa 1,2-syn, com estereosseletividades na faixa de 66:33 a >95:05 e rendimentos que variaram de 30-92% / Abstract: The chapter 1 describes the boron-mediated aldol reactions of a-methyl-b-alkoxy methylketones with achiral aldehydes. The results described here suggest a possible competition between 1,4 and 1,5 stereoindution in the construction of C-C bonds. These reactions gave the corresponding aldol adducts with selectivities ranging from 50:50 to 70:30 in good yields (82.95%). The Chapter 2 describes the aldol reaction of boron enolates generated from methylketones with chiral a-amino aldehydes for the stereoselective synthesis of 4-N-Boc-amino-3-hydroxy ketones. These reactions gave the 1,2.syn aldol aducts with diastereoselectivities ranging from 66:33 to 95:05 in good overallyields (30-92%) / Mestrado / Quimica Organica / Mestre em Química

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