Discussion Sirice it his been reported that cr-cS. Llrio-y-lactoiie~ arc c. apable of coridensatiori with guanidine, urea, or i hiourca" arid: ire susecptible to re: irrangemeiit employing: I sodium allioxide salt lo or roncentr: itcd SH, OH to yield 2-amino-~- carboallioxydihydrofurnlii and"-nmirio-:~-carboxamidodihydrofuraIi~, respectively,: lttcnipts werc directed toward the preparatioii of ac, y: iriobutyrolactoiies of type 3. Reaction of 2a ...
![methyl 4-(4-chlorophenyl)-2-[(4-methoxyphenyl)carbamoylamino]-5,5-dimethyl-4H-furan-3-carboxylate Structure](https://image.chemsrc.com/caspic/032/21863-93-4.png)
![7-(4-chlorophenyl)-4-(4-methoxyphenyl)-8,8-dimethyl-9-oxa-2,4-diazabicyclo[4.3.0]non-10-ene-3,5-dione Structure](https://image.chemsrc.com/caspic/107/21864-02-8.png)
![3-Furancarboxylicacid,4-(4-chlorophenyl)-4,5-dihydro-5,5-dimethyl-2-[[(phenylamino)carbonyl]amino]-,methyl ester Structure](https://image.chemsrc.com/caspic/108/21863-91-2.png)
![7-(4-chlorophenyl)-8,8-dimethyl-4-phenyl-9-oxa-2,4-diazabicyclo[4.3.0]non-10-ene-3,5-dione Structure](https://image.chemsrc.com/caspic/183/21864-00-6.png)
![methyl 4-(4-chlorophenyl)-2-[(4-chlorophenyl)carbamoylamino]-5,5-dimethyl-4H-furan-3-carboxylate Structure](https://image.chemsrc.com/caspic/070/21863-92-3.png)
![4,7-bis(4-chlorophenyl)-8,8-dimethyl-9-oxa-2,4-diazabicyclo[4.3.0]non-10-ene-3,5-dione Structure](https://image.chemsrc.com/caspic/145/21864-01-7.png)
![7-(4-chlorophenyl)-8,8-dimethyl-4-(4-methylphenyl)-9-oxa-2,4-diazabicyclo[4.3.0]non-10-ene-3,5-dione Structure](https://image.chemsrc.com/caspic/069/21864-03-9.png)