基于手性2-(吡啶-2-基)-取代的1,2,3,4-四氢喹啉骨架,对映选择性地合成了一个可调谐的手性吡啶-氨基膦配体的小型文库,该文库以高收率和优异的对映选择性通过钌催化的2-(吡啶-2-基)喹啉不对称氢化。该方案具有广泛的底物范围和温和的反应条件,可实现可扩展的合成。这些手性P,N配体已成功应用于Ir催化的基准烯烃和具有挑战性的七元环亚胺(包括苯并ze庚因和苯并二氮杂卓)的不对称加氢反应。在2,4-二芳基-3 H-苯并[ b ]氮杂和2,4-不对称氢化反应中,具有出色的对映和非对映选择性(高达99%ee和> 20:1 dr)和/或前所未有的化学选择性。二芳基-3 H-苯并[ b ] [1,4]二氮杂pine。
Asymmetric Hydrogenation of 2,4-Disubstituted 1,5-Benzodiazepines Using Cationic Ruthenium Diamine Catalysts: An Unusual Achiral Counteranion Induced Reversal of Enantioselectivity
作者:Zi-Yuan Ding、Fei Chen、Jie Qin、Yan-Mei He、Qing-Hua Fan
DOI:10.1002/anie.201200309
日期:2012.6.4
highly enantioselectivehydrogenation of 2,4‐disubstituted 1,5‐benzodiazepines using chiral cationicrutheniumdiaminecatalysts (R,R)‐1 has been developed (see scheme; BArF=tetrakis(3,5‐bistrifluoromethylphenyl)borate). Either enantiomer of 2,4‐diaryl‐2,3,4,5‐tetrahydro‐1H‐benzodiazepine derivatives could be obtained by using the same enantiomer of ligand but in the presence of a different achiral counteranion
Preyssler catalyst-promoted rapid, clean, and efficient condensation reactions for 3H-1,5-benzodiazepine synthesis in solvent-free conditions
作者:Gustavo A. Pasquale、Diego M. Ruiz、Jorge L. Jios、Juan C. Autino、Gustavo P. Romanelli
DOI:10.1016/j.tetlet.2013.09.101
日期:2013.11
A simple, convenient, and environmentally benign synthesis of 1,5-benzodiazepines is developed by condensing different o-phenylenediamines and 1,3-aryl-1,3-propanodiones. The reaction is catalyzed by a Preyssler (NaH14P5W30O110, HPA) heteropolyacid as a safe, clean, and recyclable catalyst. The method is operationally simple and provides access to a variety of 1,5-benzodiazepines in good to excellent yields. (C) 2013 Elsevier Ltd. All rights reserved.
Takahashi, Masahiko; Takada, Tsugumasa; Sakagami, Takeshi, Journal of Heterocyclic Chemistry, 1987, vol. 24, p. 797 - 799
Simple and efficient Ga(OTf)(3)-catalyzed [4+3] cycloaddition of 1,3-diarylpropynones and o-phenylenediamines is developed for the preparation of 2,4-disubstituted-3H-benzo[b][1,4]diazepines. The reaction has advantages of using a green solvent, generating a minimal amount of waste, and easy catalyst recycle. (C) 2013 Elsevier Ltd. All rights reserved.
TAKAHASHI, MASAHIKO;TAKADA, TSUGUMASA;SAKAGAMI, TAKESHI, J. HETEROCYCL. CHEM., 24,(1987) N 3, 797-799