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69449088315
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note
-
Hartwig reported that solvent influences the reactivity and enantioselectivity of enantioselective allylic amination. Although reactions in the polar solvents, such as DMF and EtOH were fast (100% conversion after 2 h), low ee's were observed (80-77% ee). As a result, THF was recommended as the most suitable balance of rate (100% conversion after 8-10 h) and enantioselectivity (95% ee). See reference 6.
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39
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0345306320
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44
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69449100090
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note
-
3, 100 MHz): δ = -5.08, -4.16, 18.0, 20.6, 25.7, 55.3, 55.7, 62.5, 70.6, 99.1, 103.6, 111.8, 117.4, 131.5, 136.3, 148.3, 151.7.
-
-
-
-
45
-
-
69449091883
-
-
note
-
The allylic amination of 6 with an achiral iridium complex decorated with triphenylphosphite was briefly investigated. In this case, a 53:47 mixture of products 10b and 11b, together with recovered starting material 6 (17%) was isolated (77% yield based on the consumed starting material; Scheme 7). (Chemical Equation Presented)
-
-
-
-
46
-
-
69449102400
-
-
note
-
Our initial attempts to promote N-dearylation of 11a with CAN were complicated by formation of varying amounts of p-quinone ii (Scheme 8). See also the reference 18b. (Chemical Equation Presented)
-
-
-
-
47
-
-
69449106140
-
-
note
-
A competitive experiment using a 1:1 mixture of p-anisidine and 2,4-dimethoxyaniline was carried out in order to compare reactivity. In this reaction, a 7:3 mixture of products 10b and 10a was obtained in 86% combined yield (Scheme 9). This indicates that 2,4-dimethoxyaniline is approximately two times more nucleophilic than p-anisidine. (Chemical Equation Presented)
-
-
-
-
48
-
-
0000012858
-
-
For the empirical rule for assignment of relative configurations of trans- and cis-oxazolidinones, see: (a)
-
For the empirical rule for assignment of relative configurations of trans- and cis-oxazolidinones, see: (a) Futagawa, S.; Inui, T.; Shiba, T. Bull. Chem. Soc. Jpn. 1973, 46, 3308.
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Futagawa, S.1
Inui, T.2
Shiba, T.3
-
49
-
-
0000343159
-
-
1,2 values between 15 (7.2 Hz) and 16 (7.7 Hz) may not allow the use of empirical rule reported by Futagawa
-
1,2 values between 15 (7.2 Hz) and 16 (7.7 Hz) may not allow the use of empirical rule reported by Futagawa.
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Murakami, M.1
Ito, H.2
Ito, Y.3
-
50
-
-
0037414555
-
-
C = 19.6 ppm for i and 16.8 ppm for ii) may support the assignment of relative stereochemistry (Figure 4). (Chemical Equation Presented)
-
C = 19.6 ppm for i and 16.8 ppm for ii) may support the assignment of relative stereochemistry (Figure 4). (Chemical Equation Presented)
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(2003)
J. Org. Chem.
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Kim, J.D.1
Zee, O.P.2
Jung, Y.H.3
-
51
-
-
69449096696
-
-
note
-
3, 100 MHz): δ = -4.90, -4.48, 17.9, 20.7, 25.7, 52.0, 58.6, 70.0, 115.2, 137.2, 156.8.
-
-
-
-
52
-
-
69449096428
-
-
note
-
In initial attempts to synthesize the intermediate in the polyoxamic acid synthesis, allylic carbonate i was synthesized from an intermediate prepared in our previous synthesis of polyoxamic acid (ref. 4a). Iridium-catalyzed allylic amination of i resulted in predominant formation of the linear product ii, and none of desired branched products was recognized (Scheme 10). It appears that the acetonide group is responsible for the erosion in regioselectivity through steric interactions and/or chelation effects. Further studies to reveal the effects of protecting groups on the iridium-catalyzed allylic amination reaction are underway. (Chemical Equation Presented)
-
-
-
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53
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0022407260
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0344211940
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