Cascade Syntheses of Aza[2,1-b][1,3]-benzothiazinone Heteropolycyclic Compounds from Cyclic Thiourea Catalyzed by Cu(I). -Preliminary investigations with ester (I) and the corresponding carboxylic acid reveal that the yield is significantly decreased in the latter case. Thus, methyl ester substrates are used for the preparation of the important pharmacophore. -(CHEN, D.; WU, J.; YANG, J.; HUANG, L.; XIANG, Y.; BAO*, W.; Tetrahedron Lett. 53 (2012) 52, 7104-7107, http://dx.
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