PARTE EXPERIMENTALpermaneceu sob agitação magnética à temperatura ambiente. O fluxo <strong>de</strong>nitrogênio foi interrompi<strong>do</strong> 30 minutos após o final da adição <strong>do</strong>s reagentes.Após 24 horas, havia no meio reacional um precipita<strong>do</strong> branco, e a soluçãoera amarela. O meio foi filtra<strong>do</strong> em algodão e a fase orgânica evaporada sobpressão reduzida a 40ºC. Em seguida, o óleo amarelo obti<strong>do</strong> foi dissolvi<strong>do</strong>em 20 mL <strong>de</strong> acetato <strong>de</strong> etila e extraí<strong>do</strong> com solução aquosa <strong>de</strong> HCl 2 M (3x 10 mL) e água <strong>de</strong>stilada (1 x 10 mL), e seco sob sulfato <strong>de</strong> magnésioanidro. A fase orgânica foi então filtrada em algodão e evaporada sobpressão reduzida. Os <strong>de</strong>riva<strong>do</strong>s <strong>de</strong> Meldrum foram conserva<strong>do</strong>s em freezer a–20ºC, e utiliza<strong>do</strong>s para a próxima etapa o mais rapidamente possível.Observou-se rendimentos quantitativos para to<strong>do</strong>s os <strong>de</strong>riva<strong>do</strong>s <strong>de</strong> Meldrumobti<strong>do</strong>s.Síntese das N-(3-oxoacil)-HSLs (b). À uma solução <strong>do</strong> <strong>de</strong>riva<strong>do</strong> <strong>de</strong>Meldrum (0,75 mmol <strong>de</strong> hexanoil-Meldrum, <strong>de</strong>canoil-Meldrum ou<strong>do</strong><strong>de</strong>canoil-Meldrum) em 22,5 mL <strong>de</strong> acetonitrila grau HPLC <strong>de</strong> purezaadicionou-se 0,75 mmol <strong>de</strong> bromidrato ou cloridrato <strong>de</strong> (R), (S) ou (±)-αamino-γ-butirolactonae 1,2 mmol <strong>de</strong> trietilamina (126,44 μL). A misturapermaneceu sob agitação magnética à temperatura ambiente durante 2 horase <strong>de</strong>pois sob refluxo por 3 horas. Em seguida, a fase orgânica foi evaporadasob pressão reduzida e o sóli<strong>do</strong> branco dissolvi<strong>do</strong> com 20 mL <strong>de</strong> acetato <strong>de</strong>etila e 5 mL <strong>de</strong> metanol. A fase orgânica foi então extraída com soluçõesaquosas <strong>de</strong> NaHCO 3 saturada (3 x 10 mL), KHSO 4 1M (3 x 10 mL) esalmoura (3 x 10 mL). Em seguida, ela foi seca com sulfato <strong>de</strong> magnésioanidro, filtrada e evaporada, ren<strong>de</strong>n<strong>do</strong> um sóli<strong>do</strong> amarela<strong>do</strong>.Os produtos das reações foram purifica<strong>do</strong>s por cromatografia emcoluna (12 g <strong>de</strong> sílica; coluna com 2 cm <strong>de</strong> diâmetro), com os solventes141
PARTE EXPERIMENTALhexano, diclorometano e acetato <strong>de</strong> etila em polarida<strong>de</strong>s crescentes. Osprodutos foram recolhi<strong>do</strong>s como sóli<strong>do</strong>s brancos, uniformes, nas frações <strong>de</strong>polarida<strong>de</strong> diclorometano/acetato <strong>de</strong> etila 7/3.8'7'6'5'4'O3'2'O1'NH4 53 1 2OO(±)-N-(3-oxo-octanoil)-homosserina lactona. Rendimento global: 28%. R f 0,421 (AcEt 100%). CG-EM (IE, 70 eV) m/z: 241 (M + , 1%), 224(24%), 185 (7%), 143 (25%), 102 (7 %), 99 (31%), 56 (100%).IV (KBr). 3258, 2934, 1777, 1716, 1646, 1546, 1173, 1019, 599 cm -1 .RMN <strong>de</strong> 1 H (300,06 MHz, CDCl 3 , TMS): δ 0,89 (t, 3H, J 7.0 Hz, H-8’); 1,30 (m, 4H, H-6’, H-7’); 1,59 (quinteto, 2H, J 7,3 Hz, H-5’); 2,28 (m,1H, H-4); 2,53 (t, 2H, J 7,3 Hz, H-4’); 2,75 (m, 1H, H-4); 3,47 (s, 2H, H-2’);4.28 (ddd, 1H, J 11,0; 9,1 e 6,2; Hz, H-5); 4,47 (t, 1H, J 8,2 Hz, H-5); 4,60(ddd, 1H, J 11,3; 8,8 e 6,2 Hz, H-3); 7,70 (d, NH, J 5,1 Hz).RMN <strong>de</strong> 13 C (75,45 MHz, CDCl 3 , TMS): δ 13,8 (C-8’); 22,32 (C-7’);23,0 (C-6’); 31,1 (C-5’); 29,8 (C-4); 43,8 (C-4’); 48,1 (C-2’); 49,0 (C-3);65,8 (C-5); 166,4 (C-1’); 174,8 (C-2); 206,5 (C-3’).142
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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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XVIII3.3.4.2. Síntese da (S)-N-(2E
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XX5.4.10. Co-injeções das acil-HS
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