Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2005-10-24
2009-10-13
Saeed, Kamal A (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
active
07601847
ABSTRACT:
The present invention concerns processes for the production and purification of compounds of the formula:where R1-R10are as defined in the specification. Preferred processes of the invention utilize a lithium bis(trimethylsilyl)amide, lithium dicyclohexylamide, or potassium bis(trimethylsilyl)amide base and a R1—X alkylating agent where X is as described in the specification. An alcohol preferably is added to the product solution is used to promote crystallization of the desired product.
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Considine John Leo
Ding Zhixian
Vid Galina
Pepper Hamilton LLP
Rodriguez-Garcia Valerie
Saeed Kamal A
Wyeth
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