Reaction of Huisgen Zwitterion with 1,2-Benzoquinones and Isatins: Expeditious Synthesis of Dihydro-1,2,3-benzoxadiazoles and Spirooxadiazolines
摘要:
The zwitterionic intermediate generated from dialkyl azodicarboxylate and triphenylphosphine on reaction with 3-methoxy-1,2-benzoquinones afforded dihydro-1,2,3-benzoxadiazoles. N-Substituted isatins furnished spirooxadiazolines under similar conditions.
Triphenylphosphane-Mediated Addition of Dimethyl Acetylenedicarboxylate to 1,2- and 1,4-Benzoquinones: Synthesis of Novel γ-Spirolactones
作者:Vijay Nair、J. Somarajan Nair、A. U. Vinod
DOI:10.1055/s-2000-8212
日期:——
The zwitterionic intermediate, generated by the addition of triphenylphosphane to dimethyl acetylenedicarboxylate, undergoes facile addition to ortho- and para-quinones to afford highly functionalized novel unsaturated γ-spirolactones in moderate to high yields.
1,3-Dipolar cycloaddition reactions of nitrile-N-oxides with o-benzoquinones
作者:Vijay Nair、K.V. Radhakrishnan、K.C. Sheela、Nigam P. Rath
DOI:10.1016/s0040-4020(99)00887-x
日期:1999.12
Di- and tri-substituted o-benzoquinones on reaction with nitrile N-oxides afforded novel mono spirodioxazole derivatives. The reaction of monosubstituted o-benzoquinones with stable nitrile oxides resulted in the formation of bis adducts.
Hetero Diels-Alder reaction of o-benzoquinones with tetracyclone: An efficient synthesis of benzodioxinone derivatives
作者:Vijay Nair、Bini Mathew、K.V. Radhakrishnan、Nigam P. Rath
DOI:10.1016/s0040-4020(99)00609-2
日期:1999.9
o-Benzoquinones undergo facile hetero Diels-Alderreaction with tetracyclone leading to cyclopenta[b][1,4]benzodioxinones.
邻苯醌与四环酮容易进行异Diels-Alder反应,生成环戊[b] [1,4]苯并二恶英。
1,3-Dipolar cycloaddition reactions of carbonyl ylides with 1,2-diones: synthesis of novel spiro oxabicycles
作者:Vijay Nair、K.C Sheela、D Sethumadhavan、R Dhanya、Nigam P Rath
DOI:10.1016/s0040-4020(02)00387-3
日期:2002.5
1,3-Dipolar cycloaddition reaction of carbonylylides with various o-quinones afforded highly oxygenated spiro oxabicycles.
羰基化物与各种邻醌的1,3-偶极环加成反应提供了高度氧化的螺氧杂双环。
Triphenylphosphine promoted addition of dimethyl acetylenedicarboxylate to 1,2-benzoquinones: facile synthesis of novel γ-spirolactones
作者:Vijay Nair、J. Somarajan Nair、A. U. Vinod、Nigam P. Rath
DOI:10.1039/a706272i
日期:——
The addition of dimethyl acetylenedicarboxylate to o-quinones in the presence of triphenylphosphine leading to highly functionalised γ-spirolactones is reported.