Umpolung Reactivity of Difluoroenol Silyl Ethers with Amines and Amino Alcohols. Application to the Synthesis of Enantiopure α-Difluoromethyl Amines and Amino Acids
摘要:
Difluoroenol silyl ethers, produced in situ from acylsilanes and CF3TMS, react as electrophiles with amines to give difluoroimines, via the corresponding hemiaminal adduct, as evidenced by F-19 NMR spectroscopy. Reaction with (R)-phenylglycinol led to 2-difluoromethyloxazolidines. After separation of the diastereomers, reduction with LAH and Strecker-type synthesis gave enantiopure alpha-difluoromethy-lamines and alpha-difluoromethyl-alpha-amino acids, respectively.
[EN] N-HETEROARYLALKYL-2-(HETEROCYCLYL AND HETEROCYCLYLMETHYL) ACETAMIDE DERIVATIVES AS SSTR4 AGONISTS<br/>[FR] DÉRIVÉS DE N-HÉTÉROARYLALKYLE-2-(HÉTÉROCYCLYLE ET HÉTÉROCYCLYLMÉTHYLE) ACÉTAMIDE UTILISÉS EN TANT QU'AGONISTES DE SSTR4
申请人:TAKEDA PHARMACEUTICALS CO
公开号:WO2021202781A1
公开(公告)日:2021-10-07
Disclosed are compounds of Formula 1, and pharmaceutically acceptable salts thereof, wherein L, n, R1, R2, R6, R7, R8, R9, R10, X3, X4 and X5 are defined in the specification. This disclosure also relates to materials and methods for preparing compounds of Formula 1, to pharmaceutical compositions which contain them, and to their use for treating diseases, disorders, and conditions associated with SSTR4.
The ruthenium-catalyzed asymmetric reductiveamination of aryl-trifluoromethyl ketones affording high value primary α-(trifluoromethyl)arylmethylamines using cheap NH4OAc as the nitrogen source and H2 as the reductant is reported. This user-friendly and simple catalytic method tolerates various aromatic functions with electron-withdrawing or -donating substituents at the para- or meta-positions and