70128-19-7Relevant academic research and scientific papers
Repurposing an Aldolase for the Chemoenzymatic Synthesis of Substituted Quinolines
Fansher, Douglas J.,Granger, Richard,Kaur, Satinderpal,Palmer, David R. J.
, p. 6939 - 6943 (2021/06/28)
Quinoline derivatives are important natural products and pharmaceuticals, but their synthesis can be challenging due to poor yields, harsh reaction conditions, and instability of starting materials. Here we report the chemoenzymatic synthesis of quinaldic acids under mild conditions using an aldolase, trans-o-hydroxybenzylidenepyruvate hydratase-aldolase (NahE, or HBPA). A series of 2-aminobenzaldehydes derived from reduction of the corresponding nitro analogue were reacted with pyruvate in the presence of NahE to give substituted quinolines in up to 93% isolated yield. This reaction differs from the aldol condensation catalyzed by NahE in vivo, instead resembling the heterocycle formation catalyzed by its homologue, dihydrodipicolinate synthase.
NOVEL CRYSTAL OF TRITERPENE DERIVATIVE
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Page/Page column 10-11, (2008/06/13)
Disclosed herein are a novel crystal of a novel triterpene derivative, a method for producing the crystals, and a pharmaceutical preparation obtained by using the crystals. The novel crystal is a crystal of a compound (I) of the formula (I):
PROCESS FOR PRODUCING TRITERPENE DERIVATIVE
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Page 11, (2008/06/13)
A process for a preparation of Compound (V), a pharmaceutically acceptable salt or a solvate thereof, said process comprising the steps represented by the following formula: wherein R1 and R2 are each independently C1 - C8 alkyl
Practical large-scale synthesis of endothelin receptor antagonist S-0139
Konoike, Toshiro,Oda, Katsuo,Uenaka, Masaaki,Takahashi, Kazuhiro
, p. 347 - 351 (2013/09/08)
Semisynthetic endothelin receptor antagonist S-0139 was synthesized in 14 steps from oleanolic acid 2 in a 20% overall yield on a multi-kilogram scale. Our previous synthesis of the oleanane skeleton was modified and improved to give phosphonate 9 as a ke
