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DOI: 10.1055/s-0030-1258524
Practical Synthesis of the C-1027 Aminosugar Moiety
Publication History
Publication Date:
27 July 2010 (online)
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Abstract
A concise and reliable synthetic route to the aminosugar moiety of the C-1027 chromophore was developed. The aminosugar moiety was synthesized from l-glutamic acid in 11 steps and 13% overall yield.
Key words
C-1027 - enediyne - carbohydrate - natural products - synthesis
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- Supporting Information
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References and Notes
Selected Data
for 9
Colorless needles; mp 162-164 ˚C
(EtOAc); [α]D
²9 +8.6
(c 1.00, CH2Cl2).
FT-IR (film): ν = 2944, 1742, 1458, 1275, 1179,
1114, 1041, 1014, 884, 801, 695 cm-¹. ¹H
NMR (400 MHz, CDCl3): δ = 0.94-1.15
(28 H, m, TIDPS), 1.45 (3 H, s, H6), 1.61 (3 H, s, H6), 2.53 (6
H, s, NMe2), 2.71 (1 H, d, J = 1.6
Hz, H4), 4.43 (1 H, d, J = 2.4
Hz, H2), 4.82 (1 H, dd, J = 2.4, 1.6 Hz, H3). ¹³C
NMR (100 MHz, CDCl3): δ = 12.8, 13.3,
14.0, 14.3, 16.8, 16.9, 17.2, 17.2, 17.3, 17.6, 17.6, 17.9, 25.7,
24.6 (C6), 31.4 (C6), 45.0 (NMe2), 68.7 (C4), 71.8 (C3),
76.7 (C2), 87.4 (C5), 169.3 (C1). ESI-HRMS: m/z calcd
for C21H43NNaO5Si2
+ [M + Na+]:
468.2572; found: 468.2575.
Selected Data
for 2
Colorless oil; [α]D
²7 -19.0
(c 1.00, CHCl3). FT-IR (film): ν = 3386,
2867, 1465, 1386, 1364, 1248, 1137 cm-¹. ¹H
NMR (400 MHz, CDCl3): δ = 1.03-1.13
(28 H, m, TIPDS), 1.30 (3 H, s, H6), 1.60 (3 H, s, H6), 2.46 (1
H, d, J = 2.4
Hz, H4), 2.55 (6 H, s, NMe2), 2.76 (1 H, br s, OH), 3.49
(1 H, dd, J = 8.0,
3.2 Hz, H2), 4.73 (1 H, dd, J = 3.2,
2.4 Hz, H3), 5.01 (1 H, br d, J = 8.0
Hz, H1). ¹³C NMR (100 MHz, CDCl3):
δ = 13.0,
13.1, 13.3, 13.6, 14.4, 17.1, 17.1, 17.4, 17.4, 17.5, 17.5, 17.6,
23.7 (C6), 30.8 (C6), 44.5 (NMe2), 69.4 (C4), 74.8 (C3),
78.1 (C2), 78.4 (C5), 90.5 (C1). ESI-HRMS:
m/z calcd for C21H46NO5Si2
+ [M + H+]:
448.2909; found: 448.2910.