Synthesis of N-alkyl-N-methyl amino acids. Scope and limitations of base-induced N-alkylation of Cbz-amino acids
摘要:
The reaction of N-benzyloxycarbonyl derivatives of aliphatic amino acids with NaH/alkyl iodides gave the corresponding N-Cbz-N-alkyl derivatives in good to high yields. The scope and limitations of this simple N-alkylation reaction were investigated as a convenient and flexible attempt to prepare unsymmetrically N,N-diprotected alpha-amino acids. The procedure is based on the N-alkylation of N-carbamoyl amino acids, a one-pot deprotection/protection sequence without extensive purification of the products. Protection of the carboxyl function is not required while the starting materials are inexpensive and commercially available. (C) 2008 Elsevier Ltd. All rights reserved.
[EN] POLYCYCLIC TLR7/8 ANTAGONISTS AND USE THEREOF IN THE TREATMENT OF IMMUNE DISORDERS<br/>[FR] ANTAGONISTES DE TLR7/8 POLYCYLIQUES ET LEUR UTILISATION DANS LE TRAITEMENT DE MALADIES IMMUNES
申请人:MERCK PATENT GMBH
公开号:WO2017106607A1
公开(公告)日:2017-06-22
The present invention relates to compounds of Formula (I) and pharmaceutically acceptable compositions thereof, useful as toll-like receptor 7/8 (TLR7/8) antagonists. In Formula (I), Ring A is aryl or heteroaryl; Ring B is aryl or heteroary; and X is C(R4)2, O, NR4, S, S(R4), or S(R4)2.
BIARYL PDE4 INHIBITORS FOR TREATING PULMONARY AND CARDIOVASCULAR DISORDERS
申请人:SINGH Jasbir
公开号:US20120213758A1
公开(公告)日:2012-08-23
The present invention relates to a genus of biaryl compounds containing at least one further ring. The compounds are PDE4 inhibitors useful for the treatment and prevention of stroke, myocardial infarct and cardiovascular inflammatory diseases and disorders. The compounds have general formula Ia, Ib, Ic or Id:
A particular embodiment is