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Only in the case of DHP-2-one 12r it was possible to get some pure fractions of both diastereomers.
-
Only in the case of DHP-2-one 12r it was possible to get some pure fractions of both diastereomers.
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63
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77949300547
-
-
No clear side products could be isolated, although multiple spots on thin-layer chromatography were visible
-
No clear side products could be isolated, although multiple spots on thin-layer chromatography were visible.
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-
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77949281799
-
-
The high diastereoselectivity of reactions involving α-aryl isocyanoacetates may also be the result of π-interaction in the transition state, apparently favoring in the cis-diastereomer
-
The high diastereoselectivity of reactions involving α-aryl isocyanoacetates may also be the result of π-interaction in the transition state, apparently favoring in the cis-diastereomer.
-
-
-
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67
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20644438873
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Te Velde, G.; Bickelhaupt, F. M.; Baerends, E. J.; Fonseca Guerra, C.; Van Gisbergen, S. J. A.; Snijders, J. G.; Ziegler, T. J. Comput. Chem. 2001, 22, 931-967.
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68
-
-
77949292086
-
-
The other diastereomer showed only a weak correlation (or none at all), which is expected for the ircro-diastereonier (Figure 1b).
-
The other diastereomer showed only a weak correlation (or none at all), which is expected for the ircro-diastereonier (Figure 1b).
-
-
-
-
69
-
-
77949279931
-
-
4 substituents, probably because in the former case these protons are deshielded by the aromatic R substituent.
-
4 substituents, probably because in the former case these protons are deshielded by the aromatic R substituent.
-
-
-
-
70
-
-
77949291877
-
-
4 substituents the coupling constant between protons H4 and H5 is generally between 4.0 and 6.0 Hz.
-
4 substituents the coupling constant between protons H4 and H5 is generally between 4.0 and 6.0 Hz.
-
-
-
-
71
-
-
77949280778
-
-
The cis-diastereomer was selectively crystallized from a solution containing a 83:17 (cis:trans) mixture of diastereomers;
-
a) The cis-diastereomer was selectively crystallized from a solution containing a 83:17 (cis:trans) mixture of diastereomers;
-
-
-
-
73
-
-
77949282770
-
-
This assumption is made based on the standard Karplus Curve; see: Basic One- and Two-Dimensional NMR Spectroscopy, 3rd revised ed, Friebolin, H, Ed, Wiley-VCH: Weinheim, 1998
-
This assumption is made based on the standard Karplus Curve; see: Basic One- and Two-Dimensional NMR Spectroscopy, 3rd revised ed.; Friebolin, H., Ed.; Wiley-VCH: Weinheim, 1998.
-
-
-
-
74
-
-
77949299594
-
-
Although the stereochemistry of DHP-2-one 35b was not determined using NOE experiments, it is expected to have the same cis-diastereoselectivity as the DHP-2-ones prepared with α-aryl isocyanoacetates. The coupling constant between H4 and H5 is 4.4 Hz, which is similar to its isonitrile variant (4.5 Hz, In addition, the chemical shift value of the H4 proton is identical 4.34 vs 4.32 ppm
-
Although the stereochemistry of DHP-2-one 35b was not determined using NOE experiments, it is expected to have the same cis-diastereoselectivity as the DHP-2-ones prepared with α-aryl isocyanoacetates. The coupling constant between H4 and H5 is 4.4 Hz, which is similar to its isonitrile variant (4.5 Hz). In addition, the chemical shift value of the H4 proton is identical (4.34 vs 4.32 ppm).
-
-
-
-
75
-
-
77949280116
-
-
A table with these values is presented in the Supporting Information. In addition to the mentioned α-acidic esters, the same parameters are calculated for 11c and 34a.
-
A table with these values is presented in the Supporting Information. In addition to the mentioned α-acidic esters, the same parameters are calculated for 11c and 34a.
-
-
-
-
76
-
-
77949291550
-
-
13C NMR are denoted where possible.
-
13C NMR are denoted where possible.
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-
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