摘要 |
This invention provides compounds of Formula (I), methods for their preparation and use for preparing compounds of Formula (II) wherein R<SUB>1</SUB>, R<SUB>2</SUB>, R<SUB>3</SUB>, R<SUB>5</SUB>, R<SUB>6</SUB>, X and n are as defined in the disclosure. This invention also discloses preparation of compounds of Formula (III) wherein R<SUB>1</SUB>, R<SUB>2</SUB>, R<SUB>7</SUB>, R<SUB>8</SUB>, R<SUB>9 </SUB>and n are as defined in the disclosure. This invention also pertains to certain compounds of Formula 4 and 6 used to prepare compounds of Formula (I), wherein R<SUB>1</SUB>, R<SUB>2</SUB>, R<SUB>5</SUB>, X and n are as defined in the disclosure
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