PARTE EXPERIMENTAL5.4.8.3. Obtenção <strong>do</strong> áci<strong>do</strong> (2E)-<strong>do</strong><strong>de</strong>cenóicoA um balão <strong>de</strong> 250 mL adicionou-se 100 mL <strong>de</strong> etanol seco, 7 g <strong>de</strong>áci<strong>do</strong> 2-io<strong>do</strong>-<strong>do</strong><strong>de</strong>canóico (0,02147 mol) e 4,32 g <strong>de</strong> hidróxi<strong>do</strong> <strong>de</strong> potássio(0,07722 mol). A solução permaneceu sob refluxo em banho <strong>de</strong> água por 10horas. Em seguida, a reação foi evaporada sob pressão reduzida, dissolvidaem 500 mL <strong>de</strong> água <strong>de</strong>stilada, acidificada com H 2 SO 4 5% e extraída cométer etílico (4 x 150 mL). A fase orgânica foi seca sob sulfato <strong>de</strong> magnésioanidro, filtrada e evaporada. O produto (óleo amarelo) foi recristaliza<strong>do</strong> duasvezes com hexano quente segui<strong>do</strong> <strong>de</strong> evaporação, com a separação <strong>de</strong> umsóli<strong>do</strong> branco por filtração. O óleo amarelo restante foi exaustivamentepurifica<strong>do</strong> por cromatografia em coluna <strong>de</strong> sílica gel (2 x), com os solventeshexano, diclorometano e acetato <strong>de</strong> etila em polarida<strong>de</strong>s crescentes.12111098765432O1OHÁci<strong>do</strong> (2E)-<strong>do</strong><strong>de</strong>cenóico. Rendimento: 383,3 mg; 9,0 %.CG-EM (IE, 70 eV, <strong>de</strong>riva<strong>do</strong> metila<strong>do</strong> via diazometano) m/z 213(M +. +1, 1%), 181 (24%), 138 (24 %), 113 (33%), 96 (36%), 87 (100%), 55(66%), 41 (38%).IV (filme sobre NaCl): 2926, 2844, 1688, 1634, 1424, 1279, 934 cm -1 .RMN <strong>de</strong> 1 H (300,06 MHz, CDCl 3 , TMS): δ 0,88 (t, 3H, J 6,2 Hz, H-12), 1,27 (m, 12H, H-6 a H-11), 1,46 (m, 2H, H-5), 2,22 (m, 2H, H-4), 5,81(d, 1H, J 15,7 Hz, H-2), 7,09 (dt, 1H, J 6,7 e 15,4 Hz), 10,00 (s, OH, largo).163
PARTE EXPERIMENTALRMN <strong>de</strong> 13 C (75,45 MHz, CDCl 3 , TMS): δ 14,2 (C-12); 22,7 (C-11);27,9; 29,2; 29,3; 29,4; 29,5; 31,9 (C-5 a C-10); 32,4 (C-4); 120,6 (C-2);152,4 (C-3), 172,2 (C-1).5.4.8.4. Obtenção da (±) e (S)-(2E)-<strong>do</strong><strong>de</strong>cenoil-HSLUm balão <strong>de</strong> 5 mL adicionou-se 1 mL <strong>de</strong> água <strong>de</strong>stilada e 30,0 mg <strong>de</strong>áci<strong>do</strong> (2E)-<strong>do</strong><strong>de</strong>cenóico. Aos poucos, adicionou-se gota a gota uma solução<strong>de</strong> NaOH 0,2 M até que to<strong>do</strong> áci<strong>do</strong> fosse converti<strong>do</strong> no respectivo sal e seatingisse pH=10. Em seguida, adicionou-se 30,0 mg <strong>de</strong> cloridrato <strong>de</strong> N,Netil-diaminopropil-carbodiimida(1,57 x 10 -4 mol) e 19,11 mg <strong>de</strong> cloridrato<strong>de</strong> (±)-α-amino-γ-butirolactona (ou bromidrato <strong>de</strong> (S)-α-amino-γbutirolactona)(1,05 x 10 -4 mol), permanecen<strong>do</strong> sob agitação à temperaturaambiente. Após 24 h, a reação foi extraída com acetato <strong>de</strong> etila (3 x 10 mL)e as fases orgânicas combinadas foram extraídas com NaHCO 3 5% (3 x 10mL), KHSO 4 1M (2 x 10 mL) e NaCl satura<strong>do</strong> (3 x 10 mL), seca sob MgSO 4anidro, filtra<strong>do</strong> e evapora<strong>do</strong>. O excesso <strong>de</strong> áci<strong>do</strong> carboxílico foi removi<strong>do</strong>por uma rápida filtração em coluna <strong>de</strong> sílica gel (2 g) impregnada comsolução <strong>de</strong> KOH em álcoois (3,125 g para 50 mL <strong>de</strong> isopropanol e 20 mL <strong>de</strong>etanol), previamente lavada com acetato <strong>de</strong> etila abundante. Os produtosforam filtra<strong>do</strong>s com 100 mL <strong>de</strong> acetato <strong>de</strong> etila. Outras purificações porcromatografia em coluna <strong>de</strong> sílica gel com os solventes hexano,diclorometano e acetato <strong>de</strong> etila em polarida<strong>de</strong>s crescentes também foramutilizadas na purificação <strong>do</strong>s produtos <strong>de</strong> interesse.164
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VDEDICATÓRIADEDICO ESTE TRABALHO
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VIIIBraga, Dr. José Augusto R. Rod
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XPOMINI, A. M. ; CABEÇA, L. F. ; C
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XIIde cadeia longa. Realizou-se tam
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XIVacyl-HSLs. We have also studied
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XVINBNOEODPpmR fRMNROERLUSTDSAMTMST
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XX5.4.10. Co-injeções das acil-HS
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