Chemical process

Details Chemical process Chemical process

2008-07-01

2008-07-01

Seaman, D. Margaret (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

10599463

ABSTRACT:
The present invention provides a process for the preparation of a compound of formula (I): wherein R1is C1-6alkyl; R2and R3are, independently, C1-6alkyl; and R4is C1-6alkyl or benzyl (wherein the phenyl ring of benzyl is optionally substituted by nitro, S(O)2(C1-4alkyl), cyano, C1-4alkyl, C1-4alkoxy, C(O)(C1-4alkyl), N(C1-6alkyl)2, CF3or OCF3); the process comprising reacting a compound of formula (II): wherein R2, R3and R4are as defined above, with a suitable base; and reacting the product so formed with R1OC(O)CH2X, wherein R1is as defined above and X is chloro, bromo or iodo; wherein the process is carried out in a suitable solvent at a temperature in the range −40° C. to −5° C.; and wherein at least 0.2 moles of the compound of formula (II) are used in the process.

REFERENCES:
patent: 00/34283 (2000-06-01), None
patent: 01/92263 (2001-12-01), None

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