Asymmetric synthesis of tetracyclic substructures of Strychnos indole alkaloids
摘要:
The addition of the enolate of methyl 1-methyl-2-indoleacetate 1 and lithium 2-(lithiomethyl)indole-1-carboxyl ate 5 to pyridines and N-alkylpyridinium salts bearing a chiral auxiliary at the 3-position (tolylsulfinyl, acyl iron complexes, bornane-10,2-sultam), with subsequent acid cyclization of the resulting dihydropyridines, is investigated. (C) 2003 Elsevier Science Ltd. All rights reserved.
Efficient palladium catalyzed synthesis of heteroaromatic sulfoxides
作者:Françoise Colobert、Rafael Ballesteros-Garrido、Frédéric R. Leroux、Rafael Ballesteros、Belén Abarca
DOI:10.1016/j.tetlet.2007.07.165
日期:2007.9
The present Letter describes the efficient synthesis of novel heteroaromatic sulfoxides by means of a palladium catalyzed heteroarylation of sulfenate anions. Triazolopyridine, pyridine and thiophene sulfoxides can be obtained under mild conditions and in high yield from the corresponding heteroaryl bromides.
Studies on Novel and Chiral 1,4-Dihydropyridines. I. Synthesis and Conformational Analysis of Novel NADH Model Compounds, N-Substituted (S)-3-(p-Tolylsulfinyl)-1,4-dihydropyridines.
Novel NADH model compounds, (SS)-1-alkyl-3-(p-tolylsulfinyl)-1, 4-dihydropyridines (2) and (RS)-1-benzyl-3-[1-oxo-2-(p-tolylsulfinyl)ethyl]-1, 4-dihydropyridine (3), were synthesized. 1H-NMR study and X-ray analysis of 2 revealed its preferred conformation.
DERIVATIVES OF 1-AMINO-2-CYCLOPROPYLETHYLBORONIC ACID
申请人:Millennium Pharmaceuticals, Inc.
公开号:US20140011998A1
公开(公告)日:2014-01-09
The present invention provides novel compounds useful as proteasome inhibitors. The invention also provides pharmaceutical compositions comprising the compounds of the invention and methods of using the compositions in the treatment of various diseases.
Pyridyl Grignard reagents were prepared from the corresponding iodopyridine and EtMgBr. New cross coupling reactions of the Grignard reagents with azaheterocycles took place on the sulfinyl sulfur atom to afford biazaheteroaryls.