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In the Merck sitagliptin process a catalytic quantity of trifluoroacetic acid was added to catalyse the decarboxylation of a Meldrums acid adduct. The mechanism of this decarboxylation was proposed to occur via a α-oxoketene species.
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In the Merck sitagliptin process a catalytic quantity of trifluoroacetic acid was added to catalyse the decarboxylation of a Meldrums acid adduct. The mechanism of this decarboxylation was proposed to occur via a α-oxoketene species. Xu, F.; Armstrong, J. D., III; Zhou, G. X.; Simmons, B.; Hughes, D.; Ge, Z.; Grabowski, E. J. J. J. Am. Chem. Soc. 2004, 126, 13002-13009
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81555198111
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Submitted for publication.
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Clegg, I. M.; Gordon, C. M.; Hanna-Brown, M.; Harris, D. A.; Meldrum, K.; Velazco-Roa, M. A.; Yeo, S. P. Submitted for publication.
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81555215223
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2[(S)-dm-segphos]) are commercially available from Takasago International Corporation and Strem Chemicals, Inc.
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2[(S)-dm-segphos]) are commercially available from Takasago International Corporation and Strem Chemicals, Inc.
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25
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81555198204
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In addition to TFA and acetic acid, methanesulfonic acid, trichloroacetic acid, and chloroacetic acid were included in the screen.
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In addition to TFA and acetic acid, methanesulfonic acid, trichloroacetic acid, and chloroacetic acid were included in the screen.
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26
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2542439654
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81555198202
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Submitted for publication.
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Midelfort, K. S.; Kumar, R.; Han, S.; Karmilowicz, M. J.; McConnell, K.; Gehlhaar, D. K.; Mistry, A.; Chang, J. S.; Anderson, M.; Villalobos; Minshull, J.; Govindarajan, S.; Wong, J. W. Submitted for publication.
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Midelfort, K.S.1
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