Triarylborane derivatives, their preparation and their use as synthesis intermediates
Patent 5405960 Issued on April 11, 1995. Estimated Expiration Date: 
August 9, 2014. 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.
August 9, 2014. 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 ReferencesTetrazolylphenylboronic acid intermediates for the synthesis of AII receptor antagonists Process for preparing biphenyltetrazole compounds Patent #: 5310928 InventorsApplicationNo. 288192 filed on 08/09/1994US Classes:544/235, Bicyclo ring system having the 1,2-diazine ring as one of the cyclos544/237, Phthalazines (including hydrogenated)544/284, Additional nitrogen containing unsaturated hetero ring (e.g., thiazole, etc.)544/298, Chalcogen bonded directly to diazine ring carbon544/322, Nitrogen attached directly to diazine ring by nonionic bonding544/333, Additional hetero ring which is unsaturated544/334, Halogen attached directly to the diazine ring by nonionic bonding544/335, Chalcogen attached indirectly to the diazine ring by nonionic bonding546/13, Boron containing546/14, Silicon containing546/139, Isoquinolines (including hydrogenated)546/141, Chalcogen attached directly to the six-membered hetero ring by nonionic bonding546/143, Nitrogen, other than as nitro or nitroso, attached directly to the isoquinoline ring system by nonionic bonding546/268.4, The additional hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen548/110, Boron or silicon containing548/250, Tetrazoles (including hydrogenated)548/252, Chalcogen attached indirectly to the tetrazole ring by nonionic bonding548/254Nitrogen attached indirectly to the tetrazole ring by nonionic bondingExaminersPrimary: Lee, Mary C.Assistant: McKane, Joseph K. Attorney, Agent or FirmInternational ClassesC07D 257/04C07D 237/28 Foreign Application Priority Data1993-11-26 FRAbstractTriarylborane derivatives corresponding to the formula (1) ##STR1## in which R either represents a group --CR1 R2 R3 where R1, R2 and R3 are each, independently of one another, a (C1 -C2)alkyl or aryl group, or represents a group --CH2 OR4 where R4 is a (C1 -C2)alkyl or benzyl group, or represents a group --Si(R5)3 where R5 is a (C1 -C2)alkyl or aryl group, R being in the 1 or 2 position of the tetrazole ring, their preparation and their use as synthesis intermediates.Field of SearchBoron or silicon containingTetrazoles (including hydrogenated) Chalcogen attached indirectly to the tetrazole ring by nonionic bonding Nitrogen attached indirectly to the tetrazole ring by nonionic bonding Bicyclo ring system having the 1,2-diazine ring as one of the cyclos Phthalazines (including hydrogenated) Additional nitrogen containing unsaturated hetero ring (e.g., thiazole, etc.) Chalcogen bonded directly to diazine ring carbon Nitrogen attached directly to diazine ring by nonionic bonding Additional hetero ring which is unsaturated Halogen attached directly to the diazine ring by nonionic bonding Chalcogen attached indirectly to the diazine ring by nonionic bonding Silicon containing Isoquinolines (including hydrogenated) Chalcogen attached directly to the six-membered hetero ring by nonionic bonding Nitrogen, other than as nitro or nitroso, attached directly to the isoquinoline ring system by nonionic bonding |
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