Srivastava, Ambika; Chandra, Atish; Singh, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2005, vol. 44, # 10, p. 2077 - 2081
An alternative synthesis of pyrimido[4,5-b]quinoline-4-ones via metal-free amination in water and Vilsmeier–Haack cyclization
作者:Radhey M. Singh、Neha Sharma、Ritush Kumar、Mrityunjaya Asthana、Shraddha Upadhyay
DOI:10.1016/j.tet.2012.10.004
日期:2012.12
Two-step synthesis of pyrimido[4,5-b]quinoline-4-ones is described from 2-chloroquinoline-3-carbonitries via amination and cyclization reactions, respectively. The amination reactions proceeded much faster in water via simple SNAr displacement reactions of chlorine. The cyclization reactions using Vilsmeier reagent at 60 °C gave the best yield of the products. The isolation of starting compound from
从2-氯喹啉-3-碳酸盐通过胺化和环化反应分别描述了嘧啶[4,5 - b ]喹啉-4-酮的两步合成。通过简单的氯的S N Ar置换反应,胺化反应在水中的进行速度大大加快。使用Vilsmeier试剂在60°C下进行环化反应可得到最佳的产物收率。从环化产物与I 2 / K 2 CO 3的反应中分离起始化合物为环化产物的结构提供了进一步的化学证明。提出了合理的环化机理。
Copper-free Sonogashira coupling of 2-chloroquinolines with phenyl acetylene and quick annulation to benzo[b][1,6]naphthyridine derivatives in aqueous ammonia
作者:Atish Chandra、Bhawana Singh、Shraddha Upadhyay、Radhey M. Singh
DOI:10.1016/j.tet.2008.10.010
日期:2008.12
An efficient copper-freeSonogashiracoupling of 2-chloroquinolines with phenyl acetylene to 2-ethynylquinolines is described. We further discussed the one pot facile annulation of 2-alkynylquinoline-3-carboxaldehydes to 3-phenylbenzo[b][1,6]naphthyridines in aqueous ammonia in excellent yield.
描述了2-氯喹啉与苯基乙炔到2-乙炔基喹啉的有效的无铜Sonogashira偶联。我们进一步讨论了在氨水中,2-炔基喹啉-3-甲醛与3-苯基苯并[ b ] [1,6]萘啶的一锅法环氧化反应,收率很好。
Srivastava, Ambika; Singh, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2005, vol. 44, # 9, p. 1868 - 1875
作者:Srivastava, Ambika、Singh
DOI:——
日期:——
Upadhyay, Shraddha; Chandra, Atish; Singh, Radhey M., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2009, vol. 48, # 1, p. 152 - 154
作者:Upadhyay, Shraddha、Chandra, Atish、Singh, Radhey M.
DOI:——
日期:——
Base-catalyzed cyclization reaction of 2-chloroquinoline-3-carbonitriles and guanidine hydrochloride: a rapid synthesis of 2-amino-3H-pyrimido[4,5-b]quinolin-4-ones
作者:Atish Chandra、Shraddha Upadhyay、Bhawana Singh、Neha Sharma、Radhey M. Singh
DOI:10.1016/j.tet.2011.09.032
日期:2011.11
t-BuOK-catalyzed cyclization of 2-chloroquinoline-3-carbonitriles with guanidine hydrochloride provided simple and rapid synthesis of 2-amino-3H-pyrimido[4,5-b]quinolin-4-ones in very short reaction time with good yield. Other 1,3-binucleophiles are found to react at the same rate. This methodology could be extended with their 3-formyl and 3-ester derivatives for the synthesis of pyrimido annulated quinolines. (C) 2011 Elsevier Ltd. All rights reserved.