Process for the manufacture of 3-methylene-butyric acid...

Details Process for the manufacture of 3-methylene-butyric acid... Process for the manufacture of 3-methylene-butyric acid...

C - Chemistry, Metallurgy

07

D

260/300, 260/336

C07D 205/08 (2006.01) C07D 403/12 (2006.01)

Patent

CA 1086755

Process for the Manufacture of 3-Methylene-butyric Acid Derivatives Abstract of the Disclosure 3-Methylene-butyric acid derivatives of the formula (IVb or IVc) wherein R? represents an acyl group, R? is halogen or to- gether with the carbonyl grouping -C(=0)- forms an esteri- fied, protected carboxyl group and Y denotes a group of the formula -S02-R5 (IVb) bonded by the sulphur atom to the thio group -S-, or a group -S-S02-R5 (IVc), wherein R5 represents an optionally substituted aliphatic, cyclo- aliphatic, araliphatic or aromatic hydrocarbon radical with up to 18 carbon atoms, are prepared a) by treatment of esters of penicillanic acid-1-oxid compounds with a sulphinic acid of the formula H-S02-R5, a sulphonyl cyanide of the formula N?C-S02-R5 or a thiosulpho- nic acid of the formula H-S-S02-R5, or b) by treatment of esters of compounds of the formula IVa, wherein Y represents a group of the formula -S-R4, wherein R4 is an aromatic heterocyclic radical, with a heavy metal sulphinate of the formula Mn+(?S02-R5)n or with heavy metal thiosulphinate of the formula Mn+(?S-S02-R5)n.

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