N

from sb thiourea + a-bromoketone r"

from sb thiourea + a-bromoketone, w.c.s.

from sb dibromoether + thiourea, w.c.s.

thiazolidines

HN CN R1

2-methylene-2,3-dihydrothiazoles from sb cyanoacetamide + 1. RNCS/DBU, 2. a-haloketone/HOAc

thiazolidinones

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