Inaug.-Diss.--Halle. / Vita.

Inaug.-Diss.--Halle. / Vita.

The background for "The Song of Hiawatha" is explicitly American, for Longfellow has preserved many legends, traditions, and customs of the aborigines with fidelity. As a whole, "The Song of Hiawatha" is a successful delineation of the aborigines of North America. Longfellow preserved the most interesting legends and supplemented them with accounts of Indian life.

Though overlooked and largely unread today, the long narrative poem was a distinct genre available to nineteenth-century American poets. Thematically and formally diverse, the long narrative poem represents a form that poets experimented with and modified, and it accounted for some of the most successful poetry publications in the nineteenth-century United States. Drawing on contemporary theories of form and situating these poems within their literary-historical context, I discuss how our reading practices might be shaped by a greater attentiveness to the long narrative poem. My analysis will focus upon a small set of poems from across the nineteenth century, centering on works by Lucy Larcom and Henry Wadsworth Longfellow. More than mere recovery, this project aims to illuminate a tradition in which poets ambitiously melded genres, claimed poetry’s place to shape public discourse, and thought deeply about the reading practices available to their audience. Along the way, I consider how the dominant critical categories in the study of poetry have occluded these poems, and what these poems might offer in terms renewing or revitalizing our analytical tools and concepts.

Inaug.--diss.--Erlangen. / Lebenslauf. "Literaturverzeichnis": p. iv-v.

Inaug.--diss.--Erlangen. / Lebenslauf. "Literaturverzeichnis": p. iv-v.

Thesis (M.A.)--Carleton University, 1993. / Includes bibliographical references. Also available in electronic format on the Internet.

No description available.

Orientador: Luiz Carlos Dias / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica / Made available in DSpace on 2018-08-07T11:46:58Z (GMT). No. of bitstreams: 1 Castro_IltonBarrosDaltrode_M.pdf: 2931991 bytes, checksum: c8a53e4f8a0a6d154ec91cd575ee9936 (MD5) Previous issue date: 2005 / Resumo: A migrastatina é um policetídeo que foi isolado da cultura de Streptomyces sp. MK929-43F1 em 2000 por Imoto e colaboradores e, posteriormente, isolado também da cultura de Streptomyces platensis NRRL 18993 por pesquisadores da Kosan Biosciences. Migrastatina apresenta um extraordinário efeito inibitório na migração de células tumorais, importantíssimo para o tratamento de metástese tumoral. Sua estereoquímica relativa e a configuração absoluta foram determinadas por análise cristalográfica de raios-X de um derivado. Migrastatina é uma macrolactona de 14 membros com uma cadeia lateral contendo anel de glutarimida. A molécula contém 5 centros estereogênicos e 3 ligações duplas. Nesse trabalho descreveremos uma rota sintética viavél para obtenção do fragmento C1-C13 da migrastatina. As etapas chaves para construção do fragmento C1- C13 são: a esterificação do ácido carboxílico 65 (fragmento C1-C6) com o álcool alílico 66 (fragmento C8-C13) e a reação de Nozaki-Hiyama-Kishi intramolecular. Os fragmentos foram construídos utilizando principalmente reações aldol syn seletiva e reações de Horner-Wadsworth-Emmons, além da utilização adequada de grupos protetores / Abstract: Migrastatin was isolated from a cultured broth of Streptomyces sp. MK929-43F1 in 2000 by Imoto and co-workers, as well as from a cultured broth of Streptomyces platensis NRRL 18993 by researchers from Kosan Biosciences. Migrastatin has a remarkable inhibitory effect on the migration of human tumor cells, very important to the tumor metastasis treatment. Its relative stereochemistry and absolute configurations were determined by X-ray analysis of a derivative. Migrastatin is a 14-membered lactone with a glutarimide side chain, 5 stereogenic centers and 3 double bonds. We wish to describe here an approach to the C1-C13 fragment of migrastatin. The key steps for the construction of the C1-C13 fragment of migrastatin are: a syn-aldol reaction to set up the C9 and C10 stereogenic centers, followed by a (Z)-seletive Horner-Wadsworth-Emmons reaction and esterification of carboxilic acid 65 (fragment C1-C6) with allylic alcohol 66 (fragment C8-C13) / Mestrado / Quimica Organica / Mestre em Química

Pumiliotoxinas e seus congêneres são compostos isolados da pele de algumas espécies de sapos das famílias Dendrobatidae, Mantellidae, Bufonidae, e Myobatrachidae, apresentando interessantes propriedades farmacológicas. As pumiliotoxinas, embora tóxicas, apresentam consideráveis atividades cardiotônicas, assim, acredita-se que as homopumiliotoxinas, as desmetilpumiliotoxinas e as desidrodesmetilpumiliotoxinas também devam apresentar. Nesse sentido, a síntese destes compostos é de extrema valia para a comunidade científica. As diazocetonas α,β-insaturadas são intermediários promissores para a síntese rápida e eficiente de diversos tipos de esqueletos químicos, entre eles, a construção do esqueleto indolizidínico presentes nas pumiliotoxinas. Cabe ressaltar que para as diazocetonas α,β-insaturadas com geometria Z provenientes de amino aldeídos, elas já apresentam a estereoquímica correta para uma direta ciclização para a construção de esqueletos indolizidínicos. Dessa forma, as etapas chaves do trabalho consistiram na preparação de amino aldeídos N-protegidos, na avaliação da reação de Horner-Wadsworth-Emmons para fornecer as diazocetonas α,β-insaturadas com geometria Z, e na reação de inserção N-H intramolecular para a obtenção do ciclo indolizidínico. Outra parte do trabalho consistiu na síntese de imino açúcares de esqueleto piperidínico com cadeias laterais alifáticas (aplicação na química medicinal) e da (-)-1deoxi-altronojirimicina, utilizando-se a mesma metodologia (uso de diazocetonas α,β-insaturadas com geometria Z). / Pumiliotoxins and their congeners are a class of compounds isolated from the skin of some frogs from the Dendrobatidae, Mantellidae, Bufonidae, e Myobatrachidae families, possessing interesting pharmacological activities (cardiotonic activity in low concentrations). Because of the big number of compounds among these toxins (about 100), synthetic methodologies that provide the preparation of these compounds (as well as analogues) in great amounts and in a fast and efficient way using common intermediates, are very important for application in chemical-biology. The α,β-unsaturated diazoketones are promising intermediates for the rapid and efficient synthesis of a range of chemical skeletons, among them, the construction of indolizidine skeleton that pumiliotoxins present. It is important to note that α,β-unsaturated diazoketones with Z geometry (prepared from amino aldehydes) have already the correct stereochemistry for a direct cyclization to construct indolizidine skeletons. The key steps of the work consisted in the preparation of N-protected amino aldehydes, evaluation of Horner-Wadsworth-Emmons reaction in order to obtain α,β-unsaturated diazoketones with Z geometry, and the intramolecular N-H insertion reaction to provide the indolizidine cycle. Another part of the work consisted in the synthesis of iminosugars with piperidine core and aliphatic side chains (application in medicinal chemistry) and in the synthesis of (-)-1-deoxy-altronojirimycin, applying the same methodology (use of α,β-unsaturated diazoketones with Z geometry).