从2-炔基苯甲醛的baylis-hillman加合物合成5 H -1,2,3-三唑并[4,3- a ] [2]苯并ze庚因
摘要:
描述了通过2-炔基苯基烯丙基叠氮化物4a-d的分子内1,3-偶极环加成反应容易地合成5 H -1,2,3-三唑并[4,3- a ] [2]苯并ze庚因5a-d。后者很容易从2-炔基苯甲醛1a-d通过Baylis-Hillman加合物2a-d获得,然后乙酰化为化合物3a-d,并用叠氮化物亲核取代为化合物4a-d。
从2-炔基苯甲醛的baylis-hillman加合物合成5 H -1,2,3-三唑并[4,3- a ] [2]苯并ze庚因
摘要:
描述了通过2-炔基苯基烯丙基叠氮化物4a-d的分子内1,3-偶极环加成反应容易地合成5 H -1,2,3-三唑并[4,3- a ] [2]苯并ze庚因5a-d。后者很容易从2-炔基苯甲醛1a-d通过Baylis-Hillman加合物2a-d获得,然后乙酰化为化合物3a-d,并用叠氮化物亲核取代为化合物4a-d。
The radical cascade cyclization of various 1,6-enynes with arylradicals by electron catalysis under metal-free reaction conditions was explored. Readily available anilines were used as radicalprecursors, and the reactions proceeded in the absence of any transition metal. These cascades comprise three C–C bond formations, which provide polycyclic structures with extended π-systems. The photophysical
The dipolar route to naphtho[2,1-<i>c</i>]isoxazoles from the baylis-hillman adducts of 2-alkynylbenzaldehydes
作者:Sang-Hoon Ji、Wan Pyo Hong、Seung Ho Ko、Kee-Jung Lee
DOI:10.1002/jhet.5570430344
日期:2006.5
A new synthesis of 4-carbomethoxynaphtho[2,1-c]isoxazoles 4a-d from methyl 3-(alkynylphenyl)-2-nitromethyl-2-propenoates 2a-d by the intramolecular nitrile oxide cycloaddition is described. The latter are readily obtained from2-alkynylbenzaldehydes through the Baylis-Hillmanadduct acetates 1a-d followed by nucleophilic substitution of nitrite anion.
描述了通过分子内一氧化氮环加成反应由3-(炔基苯基)-2-硝基甲基-2-丙烯酸2-甲基酯2a-d合成4-羰基甲氧基萘[2,1 - c ]异恶唑4a-d的新方法。后者可通过Baylis-Hillman加成乙酸酯1a-d从2-炔基苯甲醛中容易地获得,然后对亚硝酸根阴离子进行亲核取代。