A Mild and Regioselective Route to Functionalized Quinazolines
作者:Tracy M. M. Maiden、Stephen Swanson、Panayiotis A. Procopiou、Joseph P. A. Harrity
DOI:10.1002/chem.201502891
日期:2015.10.5
A Rh‐catalyzed ortho‐amidation cyclocondensation sequence gave a range of 4‐aminoquinazolines in high yield. The method features a remarkably mild C(sp2)H activation step and can be exploited to rapidly access compounds with established biological activity.
A rare, ruthenium‐catalyzed, oxazolinlyl assistedC−Hfunctionalization and three‐componentcascadecyclization for the synthesis of isoquinolinones via a metal‐carbenemigratoryinsertion is reported. The transformation is unique since it involves the formation of multiple bonds in onepot via C−Hfunctionalization and ring opening of oxazolines. Detailed mechanistic investigations reveal interesting
S–Co(II) cascade catalysis: cyclocondensation of aromatic nitriles with alkamine
作者:Haixia Ge、Ping Liu、Xiangnan Li、Wei Sun、Jianli Li、Bingqin Yang、Zhen Shi
DOI:10.1016/j.tet.2013.05.132
日期:2013.8
A solvent-free S/Co(NO3)2 cascade catalyzed cyclocondensation reaction of aromaticnitriles with 3-amino-1-propanol or 2-aminoethanol has been successfully developed under thermal and microwave conditions. By this two-component protocol, mono- and bis-oxazines and oxazolines were selectively synthesized both in good to excellent yields and short reaction times. This catalytic system exhibits excellent
A facile synthesis of 2-oxazolines using a PPh3–DDQ system
作者:Quancai Xu、Zhengning Li
DOI:10.1016/j.tetlet.2009.09.127
日期:2009.12
A facile and efficient synthesis of 2-oxazolines from N-(2-hydroxyethyl)amides using a triphenylphosphine–2,3-dichloro-5,6-dicyanobenzoquinone (PPh3–DQQ) system is described. The reaction proceeds under neutral and mild conditions, and excellent yields are obtained.
A Convenient Synthesis of 2-Oxazolines and 2-Benoxazoles with PPh3-DDQ as the Dehydrating Reagent
作者:Quancai Xu、Zhengning Li、Huiying Chen
DOI:10.1002/cjoc.201190190
日期:2011.5
2‐benoxazoles were synthesized in high yields from acylamino alcohols and acylamino‐ phenols, respectively, with triphenylphosphine‐2,3‐dichloro‐5,6‐dicyanobenzoquinone (PPh3‐DDQ) as the dehydrating and activating reagent. The synthesis was accomplished under neutral conditions.