Conformational analysis of s-triazolobenzothiazine derivatives prepared by intermolecular 1,3-dipolar cycloaddition of nitrilimines to 4-aryl-2H-1,3-benzothiazines
摘要:
A series of new 1,3,10b-trisubstituted-8,9-dimethoxy-1,10b-dihydro-5H-1,2,4-triazolo[4,3-c]=[1,3]benzothiazines (2a-i) have been synthesized by thermal [3+2]-cycloaddition of nitrilimines to 4-aryl-6, 7-dimethoxy-2H-1,3-benzothiazines (1a-d). Conformational analysis of the s-triazolobenzothiazine derivatives 2a-i was performed by NMR spectroscopy.