Intramolecular aminopalladation of alkynylamines gave intermediary alkenylpalladium compounds that hydrolyzed and isomerized to thermodynamically stable cyclic imines. Treatment of 3-alkynylamines with a catalytic amount of PdCl2(MeCN)2 gave exclusively 1-pyrrolines in good yields; 5-alkynylamines afforded 2,3,4,5-tetrahydropyridines selectively. Treatment of 4-alkynylamines with Pd(II) afforded mixtures of both 5- and 6-membered cyclic imines. Applications to the synthesis of some naturally occurring alkaloids are also described.
Direct conversion of azides to carbamates and sulfonamides using Fe/NH4Cl: effect of sonication
作者:S Chandrasekhar、Ch Narsihmulu
DOI:10.1016/s0040-4039(00)01373-3
日期:2000.10
A simple, direct and effective conversion of azides to carbamates and sulfonamides is achieved using Fe/NH4Cl in methanol. The influence of sonication and direct application in solution phase combinatorial chemistry are also studied by developing a 6x4 matrix library. (C) 2000 Elsevier Science Ltd. All rights reserved.
Palladium(II)-Catalyzed Regioselective syn-Hydroarylation of Disubstituted Alkynes Using a Removable Directing Group
作者:Zhen Liu、Joseph Derosa、Keary M. Engle
DOI:10.1021/jacs.6b08818
日期:2016.10.5
A palladium(II)-catalyzed regioselective syn-hydroarylation reaction of homopropargyl amines has been developed, wherein selectivity is controlled by a cleavable bidentate directing group. Under the optimized reaction conditions, both dialkyl and alkylaryl alkyne substrates were found to undergo hydroarylation with high selectivity. The products of this reaction contain a 4,4-disubstituted homoallylic
已经开发了钯 (II) 催化的高炔丙基胺的区域选择性顺氢芳基化反应,其中选择性由可裂解的双齿导向基团控制。在优化的反应条件下,发现二烷基和烷芳基炔底物均以高选择性进行加氢芳基化。该反应的产物含有 4,4-二取代的高烯丙基胺基序,这在药物分子和其他生物活性化合物中很常见。