ES394979A1 - A procedure for the preparation of substitute benzopyranes. (Machine-translation by Google Translate, not legally binding) - Google Patents

A procedure for the preparation of substitute benzopyranes. (Machine-translation by Google Translate, not legally binding)

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Publication number
ES394979A1
ES394979A1 ES394979A ES394979A ES394979A1 ES 394979 A1 ES394979 A1 ES 394979A1 ES 394979 A ES394979 A ES 394979A ES 394979 A ES394979 A ES 394979A ES 394979 A1 ES394979 A1 ES 394979A1
Authority
ES
Spain
Prior art keywords
general formula
compound
translation
procedure
preparation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
ES394979A
Other languages
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beecham Group PLC
Original Assignee
Beecham Group PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beecham Group PLC filed Critical Beecham Group PLC
Publication of ES394979A1 publication Critical patent/ES394979A1/en
Expired legal-status Critical Current

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Abstract

A procedure for the preparation of substituted benzopyrans of general formula (II) **(See formula)** (where R1 | is a non-aromatic hydrocarbon group of 1 to 6 carbon atoms; R2 is a cyclic heteroaromatic group containing 5 or 6 ring atoms; and R3 and R4, which may, be the same or different, represent hydrogen, a non-aromatic hydrocarbon group containing 1 to 20 carbon atoms or a hydroxyl group or derivative thereof) or salts thereof when appropriate, the method of which is to react a chromanone of general formula (III) **(See formula)** with an organometallic compound of general formula R2X, where X is an alkali metal or a magnesium-halogen group, treat with a source of protons to release a compound of general formula (IV) **(See formula)** and allowing or dehydrating this compound to give a compound of general formula (II). (Machine-translation by Google Translate, not legally binding)
ES394979A 1970-09-10 1971-09-10 A procedure for the preparation of substitute benzopyranes. (Machine-translation by Google Translate, not legally binding) Expired ES394979A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4334770 1970-09-10

Publications (1)

Publication Number Publication Date
ES394979A1 true ES394979A1 (en) 1974-03-16

Family

ID=10428382

Family Applications (1)

Application Number Title Priority Date Filing Date
ES394979A Expired ES394979A1 (en) 1970-09-10 1971-09-10 A procedure for the preparation of substitute benzopyranes. (Machine-translation by Google Translate, not legally binding)

Country Status (2)

Country Link
ES (1) ES394979A1 (en)
ZA (2) ZA716038B (en)

Also Published As

Publication number Publication date
ZA716040B (en) 1972-05-31
ZA716038B (en) 1972-06-28

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