3-(2-trialkylsilyloxy)ethyl-7-ethyl-1H-indoles and method for their preparation
Patent 5599946 Issued on February 4, 1997. Estimated Expiration Date: 
May 30, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 30, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCertain pyrano [3,4-b]indoles and thiopyrano[3,4-b]indoles Process for preparing 1,8-diethyl-1,3,4,9-tetrahydropyrano(3,4-b)-indole-1-acetic acid, etodolac Patent #: 4585877 InventorsApplicationNo. 453740 filed on 05/30/1995US Classes:548/432Pyrano(3,4-b)indoles or thiopyrano(3,4-b) indoles (including hydrogenated)ExaminersPrimary: Morris, Patricia L.Attorney, Agent or FirmInternational ClassC07D 491/052AbstractThe present invention relates to novel trialkylsilyloxy derivatives of 7-ethyltryptophol useful in the preparation of etodolac, and methods of making them, and methods of using them to prepare etodolac.Other References
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