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(a) Zheng, W.; Seletsky, B. M.; Palme, M. H.; Lydon, P. J.; Singer, L. A.; Chase, C. E.; Lemelin, C. A.; Shen, Y.; Davis, H.; Tremblay, L.; Towle, M. J.; Salvato, K. A.; Wels, B. F.; Aalfs, K. K.; Kishi, Y.; Littlefield, B. A.; Yu, M. J. Bioorg. Med. Chem. Lett. 2004, 14, 5551.
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Zheng, W.1
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Yu, M.J.1
Kishi, Y.2
Littlefield, B.A.3
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42
-
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59949088737
-
-
Littlefield, B. A.; Palme, M. H.; Seletsky, B. M.; Towle, M. J.; Yu, M. J.; Zheng, W. U.S. Patents 6214865 and 6365759 and International Patent WO99/65894.
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(c) Littlefield, B. A.; Palme, M. H.; Seletsky, B. M.; Towle, M. J.; Yu, M. J.; Zheng, W. U.S. Patents 6214865 and 6365759 and International Patent WO99/65894.
-
-
-
-
43
-
-
33845183116
-
-
For the synthetic value of this functional group, for example, see Scheme 1 in: (a) Corey, E. J.; Yu, C-M.; Kim, S. S. J. Am. Chem. Soc. 1989, 111, 5495.
-
For the synthetic value of this functional group, for example, see Scheme 1 in: (a) Corey, E. J.; Yu, C-M.; Kim, S. S. J. Am. Chem. Soc. 1989, 111, 5495.
-
-
-
-
44
-
-
59949095352
-
-
This ligand was synthesized as depicted below. For the details, see the Supporting Information, Chemical Equation Presented
-
This ligand was synthesized as depicted below. For the details, see the Supporting Information. (Chemical Equation Presented)
-
-
-
-
45
-
-
59949085144
-
-
In addition to 2,6-dimethylbenzylsulfonamide B, 2-methylbenzyl, 2,4-dimethylbenzyl, and 2,5-dimethylbenzylsulfonamides were tested, but all of them existed as oils. Using the procedure shown in ref,10 we attempted to synthesize 2,4,6-trimethylbenzylsulfonyl chloride, but unsuccessfully
-
10 we attempted to synthesize 2,4,6-trimethylbenzylsulfonyl chloride, but unsuccessfully.
-
-
-
-
46
-
-
59949101866
-
-
The tested conditions included: complexation at rt for 45 min, 1.5 h, and 2.5 h; complexation at 42°C for 45 min, 1.5 h, and 2.5 h. We attempted to follow the complexation event by react IR spectroscopy, but the result was not conclusive. Therefore, we relied on the overall performance (asymmetric induction and yield) of 2-haloallylation to draw this conclusion. We should note that, with this optimized complexation protocol, the reproducibility of 2-haloallylation was also improved.
-
The tested conditions included: complexation at rt for 45 min, 1.5 h, and 2.5 h; complexation at 42°C for 45 min, 1.5 h, and 2.5 h. We attempted to follow the complexation event by react IR spectroscopy, but the result was not conclusive. Therefore, we relied on the overall performance (asymmetric induction and yield) of 2-haloallylation to draw this conclusion. We should note that, with this optimized complexation protocol, the reproducibility of 2-haloallylation was also improved.
-
-
-
-
49
-
-
59949097261
-
-
The catalyst loading was tested for the case of 2 + 4a → 7a; the following results were obtained: 10 mol % (yield = 85%, ee = 93%), 5 mol % (yield = 76%, ee = 92%), and 2.5 mol % (yield = 60%, ee = 91%).
-
The catalyst loading was tested for the case of 2 + 4a → 7a; the following results were obtained: 10 mol % (yield = 85%, ee = 93%), 5 mol % (yield = 76%, ee = 92%), and 2.5 mol % (yield = 60%, ee = 91%).
-
-
-
-
50
-
-
59949095209
-
-
The optical purity of 4b used was better than 99%.
-
The optical purity of 4b used was better than 99%.
-
-
-
-
51
-
-
59949088630
-
-
14
-
14
-
-
-
-
52
-
-
59949091317
-
-
For the determination of absolute configuration, see Supporting Information of reference 1.
-
For the determination of absolute configuration, see Supporting Information of reference 1.
-
-
-
-
53
-
-
59949084802
-
-
In the catalytic system, Cr(III) is reduced to Cr(II) by Mn in situ
-
In the catalytic system, Cr(III) is reduced to Cr(II) by Mn in situ.
-
-
-
-
54
-
-
59949099691
-
-
3·3THF.
-
3·3THF.
-
-
-
-
55
-
-
0021775497
-
-
For a review on this subject, see: a
-
For a review on this subject, see: (a) Masamune, S.; Choy, W.; Peterson, J. S.; Sita, L. R. Angew. Chem., Int. Ed. Engl. 1985, 24, 1.
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(1985)
Angew. Chem., Int. Ed. Engl
, vol.24
, pp. 1
-
-
Masamune, S.1
Choy, W.2
Peterson, J.S.3
Sita, L.R.4
-
56
-
-
59949094363
-
-
A 30-g scale 2-iodoallylation was carried out as below, Chemical Equation Presented A 2-L three-neck, round-bottomed flask equipped with a magnetic stir bar was charged with CoPc (0.18 g, 0.296 mmol, ent-B (7.68 g, 18.0 mmol, CrBr3 (Cerac, 5.08 g, 16.4 mmol, and Mn powder (Aldrich, 29.0 g, 523 mmol, The flask was capped with rubber septa. The inner atmosphere was replaced with N2 via gentle evacuation (oil pump) and purged with N2 three times. Anhydrous THF (Baker, ultra low water, no preservative, 700 mL) and then a THF solution of Et3N (2.73 mL, 19.2 mmol; THF: 30 mL) were cannulated into the flask. The reaction mixture was stirred at 42°C for 1.5 h with a slight positive pressure of N2 and then cooled to rt. A THF solution of 2,6-lutidine (2.50 mL, 20.9 mmol; THF: 30 mL) was cannulated into the reaction flask. The reaction mixture was stirred at rt for 15 min and cooled to 0°C. A THF solution of 2-i
-
1H NMR analysis of its (+)-Mosher ester. Note: Large-scale 2-iodoallylation was carried out with the Pv- and TBDPS-protected aldehydes. The observed asymmetric induction was practically identical in the two series, but the yield in the TBDPS-series was 15-20% higher than that in the Pv series. In the TBDPS series, because of their similar polarity, the product and ligand B were separated after the alcohol was transformed into its 2,4,6-trimethylbenzenesulfonate. For the details, see the Supporting Information.
-
-
-
-
57
-
-
59949098894
-
-
This recovered ligand was shown to be as effective (asymmetric induction, yield, and reproducibility) as the original ligand
-
This recovered ligand was shown to be as effective (asymmetric induction, yield, and reproducibility) as the original ligand.
-
-
-
|