Regio- and π-Facial Selective Cycloadditions Involving 2-Phenyl-4-dimethylamino-1-thia-3-azabuta-1,3-diene and Allenic Esters: An Efficient Route to Novel 6-Alkylidene-6H-2-phenyl-5-ethoxycarbonyl-1,3-thiazines

@inproceedings{Ishar2004RegioA,
  title={Regio- and π-Facial Selective Cycloadditions Involving 2-Phenyl-4-dimethylamino-1-thia-3-azabuta-1,3-diene and Allenic Esters: An Efficient Route to Novel 6-Alkylidene-6H-2-phenyl-5-ethoxycarbonyl-1,3-thiazines},
  author={Mohan Paul Singh Ishar and Ashish Kapur and T. Prudhvi Raj and Navdeep K. Girdhar and Amritpal Kaur},
  year={2004}
}
2-Phenyl-4-dimethylamino-1-thia-3-azabuta-1,3-diene (4) undergoes regio- and stereoselective [4+2] cycloadditions with allenic esters on refluxing in CH 2 Cl 2 -beuzeue and the initially formed cycloadducts 6 furnish, afterelimination of dimethylamine, novel (E/Z)-6-alkylidene-6H-2-phenyl-5-ethoxycarbonyl-1,3-thiazines 7 and 8 in high yields. In the case of reaction with ethyl 2-methylbuta-2,3-dienoate, the adduct 6e has been isolated in very high yields. 

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