Patent ID: 8450519

Claim:
Compounds of the formula (IIa) in which R 10 is in each case independently (a) a heterocarbon group which comprises at least one heteroatom selected from the group consisting of O and N with at least one carbon-heteroatom multiple bond at the C-1 position, said group being bonded via the C-1 atom and being selected from COOR 6 , in which R 6 is hydrogen, alkyl, aryl, arylalkyl or trialkylsilyl, wherein the alkyl and the aryl may each be unsubstituted or substituted; (b) nitrile; (c) C(O)R 7 , wherein R 7 is: (i) hydrogen, (ii) halogen, (iii) O − , (iv) OM, wherein M is an alkali metal or an equivalent of an alkaline earth metal, (v) OCOR 12 , wherein R 12 is unsubstituted or substituted branched lower alkyl having from 1 to 5 carbon atoms or pivaloyl, (vi) OCOCF 3 , (vii) OSO 2 CH 3 , or (viii) OSO 2 CF 3 ; (d) a protecting or activating group customary for carboxylic acids; or, (e) C(O)NR 4 R 5 , wherein R 4 and R 5 are independently hydrogen, alkyl, aryl, arylalkyl, or trialkylsilyl, wherein the alkyl and the aryl may each be unsubstituted or substituted, or R 4 and R 5 together with the nitrogen form a six-membered heterocyclic ring system which may optionally have from 1 to 3 additional heteroatoms; or salts thereof, wherein R 4 and R 5 together with the nitrogen cannot be a 4(S)-substituted oxazolidin-2-on-3-yl in each R 10 when both radicals are C(O)NR 4 R 5 , wherein substituted means substituted by one or more of the following groups selected from halogen, hydroxyl, cyano, C 1 -C 6 -alkoxy, nitro, amino, C 1 -C 6 -alkylamino, di-C 1 -C 6 -alkylamino, carboxyl, C 1 -C 6 -alkoxycarbonyl, aminocarbonyl, halomethyl, dihalomethyl, trihalomethyl, haloethyl, dihaloethyl, trihaloethyl, tetrahaloethyl, and pentahaloethyl.