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However, a detailed study carried out by the Kobayashi group in the context of a total synthesis of neoechinulin A using chiral HPLC as the quantitation method showed a small degree of racemization for this type of reactions. See: Aoki, T. Kamisuki, S.; Kimoto, M.; Ohnishi, K.; Takakusagi, Y.; Kuramochi, K.; Takeda, Y.; Nakazaki, A.; Kuroiwa, K.; Ohuchi, T.; Sugawara, F.; Arai, T.; Kobayashi, S. Synlett 2006, 677.
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There are two previous literature examples of the partial reduction of the benzene ring in pyrazino[2,1-b]quinazoline-3,6-diones, although in an acidic reaction medium. See: (a) Bartolomé, M. T.; Buenadicha, F. L.; Avendaño, C.; Söllhuber, M. Tetrahedron: Asymmetry 1998, 9, 249.
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The 2-benzyl and 2-(4-methoxybenzyl) analogues of 4 are known in the literature, and showed similar optical rotation values to our compound (see reference 22b)
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The 2-benzyl and 2-(4-methoxybenzyl) analogues of 4 are known in the literature, and showed similar optical rotation values to our compound (see reference 22b).
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