2-苯基-3,4-二氢喹唑啉 在
air 作用下,
反应 1.0h,
以57 mg的产率得到2-苯基-4-[3H]喹唑啉酮
参考文献:
名称:
叔丁醇钾促进的N-杂环无受体脱氢
摘要:
钾叔N-杂环的丁醇促进的acceptorless脱氢高效地实现用于N-杂芳烃和氢气的过渡金属-自由条件下产生。在存在KO t Bu碱的情况下,各种六元和五元N-杂环化合物可以有效地进行无受体脱氢,从而在140°C的邻二甲苯中提供相应的N-杂芳烃和H 2气体。本协议提供了一条通往芳香族含氮化合物和H 2气体的便捷途径。
Acceptorless Dehydrogenation of N-Heterocycles by Merging Visible-Light Photoredox Catalysis and Cobalt Catalysis
作者:Ke-Han He、Fang-Fang Tan、Chao-Zheng Zhou、Gui-Jiang Zhou、Xiao-Long Yang、Yang Li
DOI:10.1002/anie.201612486
日期:2017.3.6
Herein, the first acceptorless dehydrogenation of tetrahydroquinolines (THQs), indolines, and other related N‐heterocycles, by merging visible‐light photoredox catalysis and cobalt catalysis at ambient temperature, is described. The potential applications to organic transformations and hydrogen‐storage materials are demonstrated. Primary mechanistic investigations indicate that the catalytic cycle
Electrophilically Activated Nitroalkanes in Synthesis of 3,4-Dihydroquinozalines
作者:Alexander V. Aksenov、Igor Yu. Grishin、Nicolai A. Aksenov、Vladimir V. Malyuga、Dmitrii A. Aksenov、Mezvah A. Nobi、Michael Rubin
DOI:10.3390/molecules26144274
日期:——
with polyphosphoric acid serve as efficient electrophiles in reactions with various nucleophilic amines. Strategically placed second functionality allows for the design of annulation reactions enabling preparation of various heterocycles. This strategy was employed to develop an innovative synthetic approach towards 3,4-dihydroquinazolines from readily available 2-(aminomethyl)anilines.
Syntheses of 3,4- and 1,4-dihydroquinazolines from 2-aminobenzylamine
作者:Jimena E Díaz、Silvia Ranieri、Nadia Gruber、Liliana R Orelli
DOI:10.3762/bjoc.13.145
日期:——
allows for the preparation of 3,4- and 1,4-dihydroquinazolines with different substitution patterns from 2-aminobenzylamine (2-ABA) as common precursor. The required functionalization of both amino groups present in 2-ABA was achieved by different routes involving selective N-acylation and cesium carbonate-mediated N-alkylation reactions, avoiding protection/deprotection steps. The heterocycles were efficiently
Copper-catalyzed intermolecular cyclization of nitriles and 2-aminobenzylamine for 3,4-dihydroquinazolines and quinazolines synthesis via cascade coupling and aerobic oxidation
作者:Cheng Li、Shujuan An、Yuelu Zhu、Jin Zhang、Yifan Kang、Ping Liu、Yaoyu Wang、Jianli Li
DOI:10.1039/c4ra09240f
日期:——
A copper-catalyzedcascadecoupling and aerobic oxidation of aromatic nitriles and 2-aminobenzylamine for the synthesis of 3,4-dihydroquinazolines and quinazolineshas been achieved. The catalytic system, characterized by not adding additives and using molecular oxygen as the sole oxidant, exhibited exquisite substrate specificity and operated under mild conditions through inherently “green” processes
Formation of Hydro-1,3-diazines by the Reaction of Benzo[b]cyclohepta[e][1,4]oxazine with α,γ-Diamines
作者:Ohki Sato、Manabu Seshimo、Josuke Tsunetsugu
DOI:10.1039/a707825k
日期:——
Contrary to a report that the reaction of benzo[b]cyclohepta[e][1,4]oxazine 1 with α,γ-diamine 2b produces 1,2,3,4-tetrahydrocyclohepta[b][1,4]diazepine 4, the product was found to be 2-phenyl-3,4,5,6-tetrahydropyrimidine 5b and is peculiar to the reaction of 1 with α,γ-diamines 2 as well as β-aminamide 7.
与有关苯并[ b ]环庚[[ e ] [1,4]恶嗪1与α,γ-二胺2b反应的报告相反,生成1,2,3,4-四氢环庚[ b ] [1,4]二氮杂4,发现该产物是2-苯基-3,4,5,6-四氢嘧啶5b,是1与α,γ-二胺2和β-氨基酰胺7的反应所特有的。