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As shown in Figure 5, for the stereochemistry of the tert-butoxycarbonyl group, two stereoisomers (A and B) can be drawn. The carbon atoms (C-2, C-4, and C-1′), the nitrogen atom, and the oxygen atoms (O-2′ and O-3′) would lie nearly on the same plane, (see
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See also, Conformer B would be destabilized in comparison with A owing to unfavorable interactions between the bulky tert-butyl group and the gem-dimethyl group at the C-2 position. The NOESY spectrum and the selective decoupling experiment of 4 clearly indicated a NOE between the protons of the tert-butyl group and the proton on C-4 in Figure 5A. Furthermore, the crystal structure of 23 (Figure 1) shows that the stereochemistry of the Boc group in 23 is essentially the same as shown in structure A. (Figure presented.)
-
See also: Shustov, G. V.; Kadorkina, G. K.; Varlamov, S. V.; Kachanov, A. V.; Kostyanovsky, R. G.; Rauk, A. J. Am. Chem. Soc. 1992, 114, 1616). Conformer B would be destabilized in comparison with A owing to unfavorable interactions between the bulky tert-butyl group and the gem-dimethyl group at the C-2 position. The NOESY spectrum and the selective decoupling experiment of 4 clearly indicated a NOE between the protons of the tert-butyl group and the proton on C-4 in Figure 5A. Furthermore, the crystal structure of 23 (Figure 1) shows that the stereochemistry of the Boc group in 23 is essentially the same as shown in structure A. (Figure presented.)
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