906-65-0Relevant articles and documents
Synthesis of (R)-3-(tert-Butoxycarbonylamino)-4-(2,4,5-trifluorophenyl)butanoic Acid, a Key Intermediate, and the Formal Synthesis of Sitagliptin Phosphate
Achanta, Srinivas,Bandichhor, Rakeshwar,Chaudhari, Pramod S.,Cobley, Christopher J.,Dahanukar, Vilas,Llewellyn-Beard, Fiona,Sreenivasulu, Kurella,Sud, Abhishek
, (2020/05/08)
An alternate formal synthesis of Sitagliptin phosphate is disclosed from 2,4,5-trifluorobenzadehyde in 8 linear steps with an overall yield of 31%. The chiral β-amino acid moiety present in sitaglitpin is installed via an asymmetric hydrogenation followed by a stereoselective Hofmann rearrangement as the key steps. The key chiral intermediate Boc-amino acid 1 prepared by this novel route was further converted to Sitagliptin phosphate following the known literature protocol.
Synthesis of the naphthoquinone core of divergolides (C-D) and model studies for elaboration of the ansabridge
Rasapalli, Sivappa,Jarugumilli, Gopalakrishna,Yarrapothu, Gangadhara Rao,Golen, James A.,Rheingold, Arnold L.
supporting information, p. 2615 - 2618 (2013/06/05)
Herein, we describe a facile synthesis of the naphthoquinone fragment of the aromatic core of the novel ansamycins such as hygrocins A-B and the divergolides C-D, starting from the inexpensive 2-hydroxy-3-methylbenzoic acid. We demonstrate the utility of naphthalenic synthon for further elaboration of the ansabridge via C5-C6 bond formation by employing a commercially available sterically demanding organomagnesium reagent as a model ansa chain. Facile conversion of the resulting alcohol to the naphthoquinone fragment of the targets in one pot has also been realized. These model studies set the stage for the completion of total synthesis of the biologically important novel ansamycins.
Synthesis and Analgesic Effects of N--1-oxo-2(R)-benzylpropyl>-L-isoleucyl-L-leucine, a New Potent Inhibitor of Multiple Neurotensin/Neuromedin N Degrading Enzymes
Doulut, Sylvie,Dubuc, Isabelle,Rodriguez, M.,Vecchini, F.,Fulcrand, H.,et al.
, p. 1369 - 1379 (2007/10/02)
The synthesis of N--1-oxo-2(R)-benzylpropyl>-L-isoleucyl-L-leucine (JMV-390-1, 6a), a multipeptidase inhibitor based on the C-terminal sequence common to neurotensin (NT) and neuromedin N (NN), is described.This compound behaves as a full inhibitor of the major NT/NN degrading enzymes in vitro, e.g. endopeptidase 24.16, endopeptidase 24.15, endopeptidase 24.11, and leucine aminopeptidase (type IV-S), in the nanomolar range (IC50's from 30 to 60 nM).Compound 6a was found to increase endogenous recovery of NT and NN from slices of micehypothalamus depolarized with potassium.In various assays commonly used to select analgesics, e.g. hot-plate test, tail-flick test, acetic acid-induced writhing test, in mice, compound 6a proved to be potent when intracerebroventricularly (icv) injected.The analgesic effects observed were totally (hot-plate test) or largely (tail-flick test) reversed by the opioid antagonist naltrexone.Furthermore, icv injection of compound 6a (10 μg/mouse) was found to significantly potentiate the hypothermic effects of NT or NN.
