2-(alkoxy or aryloxy carbonyl)-4-methyl-6-(2,6,6-trimethylcyclohex-1- enyl)hex-2-enoic acid compounds, its preparation and use
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Process for the preparation of spiro[2.5]octane-5,7-dione and spiro[3.5]nonane-6,8-dione
US9938228B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9938228-B2 |
| Application number | US-201515509504-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 28, 2015 |
| Priority date | Sep 9, 2014 |
| Publication date | Apr 10, 2018 |
| Grant date | Apr 10, 2018 |
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Abstract
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This invention relates to methods for the synthesis of spiro[2.5]octane-5,7-dione and spiro[3.5]nonane-6,8-dione which are useful as intermediates in the manufacture of pharmaceutically active ingredients.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of preparing spiro[2.5]octane-5,7-dione having the formula said method comprising: cyclization of cyclopropylidene carboxylic acid alkyl ester having the formula with dialkyl 1,3-acetonedicarboxylate having the formula to form 5,7-dioxo-spiro[2.5]octane-4,6-dicarboxylic acid dialkyl ester having the formula wherein each R may be independently C1-C6 alkyl, and ester hydrolysis and decarboxylation of 5,7-dioxo-spiro[2.5]octane-4,6-dicarboxylic acid to form spiro[2.5]octane-5,7-dione, wherein each R may be independently C1-C6 alkyl.
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Esters of keto-carboxylic acids {or aldehydo-carboxylic acids} · CPC title
by addition to unsaturated carbon-to-carbon bonds · CPC title
with a four-membered ring · CPC title
of compounds containing doubly bound oxygen atoms, e.g. esters · CPC title
by change of size of the carbon skeleton · CPC title
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- What does patent US9938228B2 cover?
- This invention relates to methods for the synthesis of spiro[2.5]octane-5,7-dione and spiro[3.5]nonane-6,8-dione which are useful as intermediates in the manufacture of pharmaceutically active ingredients.
- Who is the assignee on this patent?
- Boehringer Ingelheim Int
- What technology area does this patent fall under?
- Primary CPC classification C07C69/608. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 10 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).