4- oxazolone carbon disulfide

Reaction of carbon disulfide with 2-phenyl-5(4//)-oxazolone 146 followed by S-alkylation with a methyl hahde gives 4-[bis(methylthio)methylene]-2-phenyl-5(4//)-oxazolone. The solvolysis and aminolysis of this compound have also been studied. ... 

Aminomethylene)-2-phenyl-5(47/)-oxazolone 418 has been converted to 4-(alkylthiomethylene)-2-phenyl-5(47/)-oxazolones 419 by treatment with carbon disulfide and subsequent alkylation. These 4-(alkylthiomethylene) analogues are useful intermediates for biologically active peptides, pharmaceuticals, and plant-protective agents (Scheme 7.136 Table 7.38, Fig. 

The synthesis of 2(3//)-oxazolones by incorporation of carbon atom 2 into a four-atom chain is exemplified by the condensation of phenacylaniline with ethyl chloroformate (equation 138). Benzoxazolones are similarly prepared from o-aminophenols and derivatives of carbonic acid, such as phosgene, diethyl carbonate, urethane (Et02CNH2) or urea (equation 139). The analogous condensation of carbon disulfide or cyanogen bromide with o-aminophenols leads to benzoxazolethiones or 2-aminobenzoxazoles, respectively (equation 140). 

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