Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Reexamination Certificate
2005-05-31
2005-05-31
Peselev, Elli (Department: 1623)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
C536S018500, C536S018600
Reexamination Certificate
active
06900296
ABSTRACT:
The invention relates to a cost effective and industrially advantageous process for the selective methylation of a hydroxy group at the 6 position of erythromycin A derivative which comprised methylating the erythromycin A derivative with a methylating agent in a mixture of toluene and a ploar aprotic solvent.
REFERENCES:
patent: 4331803 (1982-05-01), Watanabe et al.
patent: 4670549 (1987-06-01), Morimoto et al.
patent: 4672109 (1987-06-01), Watanabe et al.
Gangakhedkar Kiran Kumar
Kumar Naresh
Lal Dorwal Harish Niranjan
Ray Parma Chandra
Salman Mohammad
Desmukh, Esq. Jayadeep R.
Hare, Esq. William D.
Heibel Esq. George E.
Peselev Elli
Ranbaxy Laboratories Limited
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