2-(alkoxy or aryloxy carbonyl)-4-methyl-6-(2,6,6-trimethylcyclohex-1- enyl)hex-2-enoic acid compounds, its preparation and use
US-2017305875-A1 · Oct 26, 2017 · US
Process for the preparation of spiro[2.5]octane-5,7-dione and spiro[3.5]nonane-6,8-dione
US10131618B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10131618-B2 |
| Application number | US-201815904464-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 26, 2018 |
| Priority date | Sep 9, 2014 |
| Publication date | Nov 20, 2018 |
| Grant date | Nov 20, 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[3.5]nonane-6,8-dione having the formula said method comprising: cyclization of cyclobutylidene carboxylic acid alkyl ester having the formula with dialkyl 1,3-acetonedicarboxylate having the formula to form 6,8-dioxo-spiro[3.5]nonane-5,7-dicarboxylic acid dialkyl ester having the formula wherein each R may be independently C1-C6 alkyl, and ester hydrolysis and decarboxylation of 6,8-dioxo-spiro[3.5]nonane-5,7-dicarboxylic acid dialkyl ester having the formula to form spiro[3.5]nonane-6,8-dione, wherein each R may be independently C1-C6 alkyl.
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by change of size of the carbon skeleton · CPC title
of compounds containing doubly bound oxygen atoms, e.g. esters · CPC title
with a three-membered ring · CPC title
having any of the groups OH, O—metal, —CHO, keto, ether, acyloxy, [IMAGE cpc-sch-C07C-0958.gif] groups,[IMAGE cpc-sch-C07C-0959.gif] groups, or[IMAGE cpc-sch-C07C-0960.gif] in the acid moiety · CPC title
Spiro compounds · CPC title
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- What does patent US10131618B2 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 Nov 20 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).