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DOI: 10.1055/s-2004-829082
Efficient Synthesis of New Macrocycles with Planar Chirality
Publication History
Publication Date:
29 June 2004 (online)
Abstract
Two new macrocycles possessing planar chirality were efficiently synthesized and resolved into enantiomers employing HPLC. CD spectra of 11 and 12 confirm their enantiomeric relationship and chiral stability.
Key words
amides - macrocycles - synthesis - supramolecular chemistry - enantiomeric resolution
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References
General Procedure for Synthesis of Macrocyclic Compounds 10-12: To a mixture of appropriate ester (5 mmol) and appropriate amine (5 mmol) in anhyd MeOH (60 mL) was added solution of MeONa (12.5 mmol) in anhyd MeOH (50 mL). The mixture was left at r.t. for several hours (monitored by TLC). The solvent was evaporated and the residue was purified by column chromatography.
1319-Benzyloxy-2,8,14-trioxa-5,11-diaza-bicyclo[13.3.1]nonadeca-1 (18),15 (19),16-triene-4,12-dione ( 10). Purified by column chromatography (silica gel, EtOAc) to give 10 (60%) as a white solid; mp 183.9-184.5 °C. 1H NMR (500 MHz, DMSO-d 6): δ = 7.82-7.76 (m, 2 H, NHCO), 7.60 (d, J = 7.0 Hz, 2 H), 7.48 (t, J = 7.0 Hz, 2 H), 7.43-7.39 (m, 1 H), 7.16 (dd, J 1 = 1.9 Hz, J 2 = 7.3 Hz, 1 H), 7.09 (d, J = 7.8 Hz, 2 H), 5.04 (s, 2 H, CH2Ph), 4.76 (dAB, J = 16.5 Hz, 2 H, CH2CO), 4.69 (dAB, J = 16.5 Hz, 2 H, CH2CO), 3.52-3.43 (m, 2 H), 3.12-3.05 (m, 4 H), 2.87-2.82 (m, 2 H). 13C NMR (125 MHz, DMSO-d 6): δ = 167.9, 152.7, 139.4, 136.1, 128.8, 128.7, 128.6, 128.5, 125.9, 125.7, 113.4, 113.2, 76.7, 71.3, 68.4, 38.6. HR-ESI (MeOH): m/z [M + Na]+ calcd for C21H24N2O6Na: 423.1532; found: 423.1542. Anal. Calcd for C21H24N2O6: C, 63.00; H, 6.00; N, 7.00. Found: C, 63.10; H, 6.01; N, 7.06.
1519-Benzyloxy-18-bromo-2,8,14-trioxa-5,11-diaza-bicyclo[13.3.1]nonadeca-1 (18),15 (19),16-triene-4,12-dione ( 11). Purified by column chromatography (silica gel, EtOAc) to give 11 (1720 mg, 72%) as a white solid; mp 172.6-173.6 °C. 1H NMR (500 MHz, CDCl3): δ = 8.59-8.53 (br d, 1 H, NHCO), 7.99-7.93 (br d, 1 H, NHCO), 7.58-7.54 (m, 2 H), 7.46-7.41 (m, 3 H), 7.37 (d, J = 9 Hz, 1 H), 6.81 (d, J = 9 Hz, 1 H), 5.06 (dAB, J = 9.5 Hz, CH2Ph, 1 H), 4.99 (dAB, J = 9.5, CH2Ph, 1 H), 4.89 (dA1B1, J = 16.5, CH2CO, 1 H), 4.82 (dA2B2, J = 16.1 Hz, CH2CO, 1 H), 4.63 (dA1B1, J = 16.5 Hz, CH2CO, 1 H), 4.52 (dA2B2, J = 16.1 Hz, CH2CO), 3.80-3.71 (m, 2 H), 3.19-3.10 (m, 3 H), 3.04-2.99 (m, 1 H), 2.96-2.88 (m, 1 H), 2.64-2.57 (m, 1 H). 13C NMR (125 MHz, CDCl3): δ = 168.5, 168.1, 153.0, 151.3, 142.5, 134.9, 130.2, 129.8, 129.3, 128.8, 115.5, 109.1, 78.5, 73.8, 72.5, 69.3, 69.1, 38.9, 38.8. HR-ESI (MeOH): m/z [M + Na]+ calcd for C21H23N2O6 79BrNa: 501.0632; found: 501.0646. Anal. Calcd for C21H23N2O6Br: C, 52.62; H, 4.84; N, 5.84; Br, 16.67. Found: C, 52.49; H, 4.93; N, 5.63; Br, 16.52.
1711-Bromo-26-(1-naphthylmethoxy)-2,8,15,21-tetraoxa-5,18-diaza-tricyclo[20.3.1.0*9,14*]hexacosa-1 (25),9 (14),10,12,22 (26),23-hexaene-4,19-dione ( 12). Purified by column chromatography (silica gel, EtOAc) to give 12 (465 mg, 15%) as white solid; mp 166.5-167.8 °C. 1H NMR (500 MHz, CDCl3): δ = 8.30-8.26 (m, 1 H), 7.98-7.93 (m, 2 H, NHCO), 7.85-7.80 (m, 1 H), 7.74-7.67 (m, 2 H), 7.52-7.47 (m, 2 H), 7.35-7.30 (m, 1 H), 7.13 (t, 1 H, J = 8.4), 6.89 (dd, 1 H, J 1 = 8.6 Hz, J 2 = 2.2 Hz), 6.79-6.74 (m, 2 H), 6.55 (d, 1 H, J = 2.2 Hz), 6.36 (d, 1 H, J = 8.6 Hz), 5.47 (s, 2 H, CH2Naph), 4.79 (ddAB, J 1 = 8.2 Hz, J 2 = 15.6 Hz, 2 H, CH2CO), 4.58 (dAB, J = 15.6 Hz, 2 H, CH2CO), 3.90-3.80 (m, 2 H), 3.71-3.65 (m, 1 H), 3.62-3.52 (m, 3 H), 3.38-3.30 (m, 2 H). 13C NMR (125 MHz, CDCl3): δ = 168.7, 168.6, 153.4, 153.3, 148.3, 146.8, 139.3, 133.5, 132.0, 131.5, 129.5, 128.9, 127.1, 126.4, 125.8, 125.7, 125.1, 123.4, 123.2, 115.4, 112.9, 112.7, 111.2, 111.0, 74.2, 70.9, 70.7, 67.3, 67.2, 38.6, 38.5. HR-ESI (MeOH): m/z [M + Na]+ calcd for C31H29N2O7 79BrNa: 643.1050, found: 643.1039. Anal. Calcd for C31H29N2O7Br: C, 59.91; H, 4.70; N, 4.51; Br, 12.86. Found: C, 60.01; H, 4.84; N, 4.38; Br, 12.74.
18HPLC analyses for 11 and 12. Column: Chiralcel OD-H®, length 250 mm; i.d. 4.6 mm. For 11: i-PrOH-hexane, 3:1; flow rate 0.7 mL/min.; λ = 254 nm. For 12: i-PrOH-hexane, 1:1; flow rate 1.1 mL/min.; λ = 254 nm. Enantiomeric purities obtained: (+)11: 93% ee, [α]D 26 = +61.8 (c = 0.56, CHCl3); (-)11: 88% ee, [α]D 26 -59.3 (c = 0.55, CHCl3); (+)12: 99% ee, [α]D 26 = +18.9 (c = 0.37, CHCl3); (-)12: 94% ee, [α]D 26 -17.9 (c = 0.37, CHCl3).
19CD experiments were measured in MeCN in a 0.1 cm cell at 24 °C.