The present invention relates to compounds of formula
1
wherein A is an unsubstituted or substituted cyclic group; and
R is hydrogen or lower alkyl;
or a pharmaceutically acceptable acid addition salt thereof.
These compounds are NMDA NR-2B receptor subtype specific blockers and are useful in the treatment of neurodegeneration, depression and pain.
thionyl bromide is demonstrated in this work. Mild reaction conditions and broad scope of substrates ranging from heterocyclic structures to pharmaceutics-potential motifs are used in the reactions of this paper. Efficient bromination of ortho CH bonds of the aryhydroxylamines has been achieved. Ortho-bromoanilide products were obtained in good to excellent yields, and model scaled-up reactions of this
synthesis of functionalized biaryls through nucleophilic aromatic substitution (SNAr) of arylhydroxylamines to arylsulfoniumsalts. With this protocol, structurally diverse functionalized biaryls were obtained smoothly in moderate to good yields. Merits of this transformation include mild reaction conditions, broad substrate scope, great functional group tolerance, feasibility of a one-pot procedure, and
我们报告了一种无过渡金属方案,用于通过芳基羟胺到芳基锍盐的亲核芳族取代 (S N Ar) 合成功能化联芳基化合物。使用该协议,结构多样的功能化联芳基以中等至良好的产量顺利获得。这种转化的优点包括反应条件温和、底物范围广、官能团耐受性好、一锅法的可行性以及易于处理和放大。
Expeditious and Efficient
<i>ortho</i>
‐Selective Trifluoromethane‐sulfonylation of Arylhydroxylamines
AbstractA metal‐ and oxidant‐free, practical and efficient method for the synthesis of highly versatile and synthetically useful ortho‐trifluoromethanesulfonylated anilines from arylhydroxylamines and trifluoromethanesulfinic chloride was developed. This rapid transformation proceeded smoothly with good yields and excellent ortho‐selectivity in the absence of any metals or ligands. Mechanistically, the reaction comprised a noncanonical O‐trifluoromethanesulfinylation of the arylhydroxylamine, and the subsequent [2,3]‐sigmatropic rearrangement to afford ortho‐trifluoromethanesulfonylated aniline derivatives. The practical application of this reaction was demonstrated by further conversion into a series of functional molecules under different reaction conditions.
(IMIDAZOL-1-YL-METHYL)-PYRIDAZINE AS NMDA RECEPTOR BLOCKER