A series of 3-amino-5-sugarimino-1, 2, 4-thiadiazolines have been synthesized by oxidative cyclization of sugar-3-amidinothiocarbamides by using bromine. These amidino thiocarbamides were prepared by interaction of guanidine and sugar isothiocynates. Guanidine itself plays an important role as antifungal, anticancer activities when it links with glycosides its acivity increased. These newly synthesized compounds have pharmaceutical uses. The identities of these newly synthesized compounds have been established on the basis of usual chemical transformation and IR, 1H NMR, and Mass spectral studies. The synthesized compounds were screened for their in vitro antimicrobial activities using human pathogens.