C - Chemistry – Metallurgy – 10 – J
Patent
C - Chemistry, Metallurgy
10
J
257/29
C10J 3/46 (2006.01) B01D 37/00 (2006.01) B01D 51/10 (2006.01) C10J 3/84 (2006.01) C10K 1/02 (2006.01) F22B 1/18 (2006.01)
Patent
CA 1202958
ABSTRACT The preparation of a penam derivative of formula (I): Image (I) wherein RA is hydrogen or a group of formula (Ia): Image (Ia) wherein X is -CO2R1, or SO3R1; R is C1-6 alkyl, aryl, or heterocyclyl; R1 is hydrogen, or a pharmaceutically acceptable salt-forming ion or ester-forming radical, and R2 represents hydrogen or a pharmaceutically acceptable salt-forming ion or in vivo hydrolysable ester-forming radical; which process comprises reacting a compound of formula (II): Image (II) wherein RB is a removable acyl group which protects the amino function or a group of formula (IIa): Image (IIa) wherein Y is -C02RX or -S03RX; n is one and m is zero or one; R is as defined with respect to formula (I) above and wherein any reactive groups may he protected; Rx represents an ester-forming radical, RY represents hydrogen, a salt-forming radical or a carboxyl-blocking group, and R3 represents an alkyl, benzyl, or aryl group; with methanol
421522
Shell Canada Limited
Smart & Biggar
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