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13
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0009671686
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note
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In our case 5-methyl-1,2,4-oxadiazoles serve as protecting groups for amidines which are crucial functionalities in the field of factor Xa antagonists.
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14
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Wang, T.-C.1
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15
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0032492980
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For O-arylation of phenols with boronic acids and cupric acetate, compare: Evans, D. A.; Katz, J. L.; West, T. R. Tetrahedron Lett. 1998, 39, 2937.
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Evans, D.A.1
Katz, J.L.2
West, T.R.3
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18
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0009671695
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note
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Initial screening of various tertiary amines with 22b revealed that pyridine was the preferred base in this series. Therefore we kept this parameter constant.
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19
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85010092114
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For the synthesis of 25b, see: Sakamoto, S.; Nagano, T.; Kondo Y.; Yamanaka, H. Chem. Pharm. Bull. 1988, 36, 2248.
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0029903104
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21
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For the synthesis and spectroscopical characterization of 8a, see: Sugahara, M.; Ukita, T. Chem. Pharm. Bull. 1997, 45, 719.
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Sugahara, M.1
Ukita, T.2
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