WO2002020498A3 - An improved process for the preparation of 3,4-dihydro-1,4-benzothiazine - Google Patents

An improved process for the preparation of 3,4-dihydro-1,4-benzothiazine Download PDF

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Publication number
WO2002020498A3
WO2002020498A3 PCT/IB2001/001615 IB0101615W WO0220498A3 WO 2002020498 A3 WO2002020498 A3 WO 2002020498A3 IB 0101615 W IB0101615 W IB 0101615W WO 0220498 A3 WO0220498 A3 WO 0220498A3
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WO
WIPO (PCT)
Prior art keywords
dihydro
preparation
formula
benzothiazine
improved process
Prior art date
Application number
PCT/IB2001/001615
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French (fr)
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WO2002020498A2 (en
Inventor
Chandrasekhar Batchu
Om Reddy Gaddam
Rabin Bera
Original Assignee
Reddy Research Foundation
Chandrasekhar Batchu
Om Reddy Gaddam
Rabin Bera
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 Reddy Research Foundation, Chandrasekhar Batchu, Om Reddy Gaddam, Rabin Bera filed Critical Reddy Research Foundation
Priority to AU2001282403A priority Critical patent/AU2001282403A1/en
Publication of WO2002020498A2 publication Critical patent/WO2002020498A2/en
Publication of WO2002020498A3 publication Critical patent/WO2002020498A3/en

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D279/00—Heterocyclic compounds containing six-membered rings having one nitrogen atom and one sulfur atom as the only ring hetero atoms
    • C07D279/10—1,4-Thiazines; Hydrogenated 1,4-thiazines
    • C07D279/14—1,4-Thiazines; Hydrogenated 1,4-thiazines condensed with carbocyclic rings or ring systems
    • C07D279/16—1,4-Thiazines; Hydrogenated 1,4-thiazines condensed with carbocyclic rings or ring systems condensed with one six-membered ring

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Nitrogen- Or Sulfur-Containing Heterocyclic Ring Compounds With Rings Of Six Or More Members (AREA)

Abstract

A process for the preparation of 3,4-dihydro-1,4-benozthiazine of the formula (1) which comprises, condensing of 2-aminothiophenol with dihaloethane of formula (11) wherein X represents halogen atom in presence of organic base and relatively non polar solvent at a temperature in the range of 40-80 °C followed by cyclization and formation of organic salt as by product and isolating the compound of formula (1) by conventional methods.
PCT/IB2001/001615 2000-09-04 2001-09-03 An improved process for the preparation of 3,4-dihydro-1,4-benzothiazine WO2002020498A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001282403A AU2001282403A1 (en) 2000-09-04 2001-09-03 An improved process for the preparation of 3,4-dihydro-1,4-benzothiazine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN719/MAS/2000 2000-09-04
IN719MA2000 2000-09-04

Publications (2)

Publication Number Publication Date
WO2002020498A2 WO2002020498A2 (en) 2002-03-14
WO2002020498A3 true WO2002020498A3 (en) 2002-08-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/001615 WO2002020498A2 (en) 2000-09-04 2001-09-03 An improved process for the preparation of 3,4-dihydro-1,4-benzothiazine

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AU (1) AU2001282403A1 (en)
WO (1) WO2002020498A2 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02264768A (en) * 1989-04-04 1990-10-29 Ube Ind Ltd Production of 3,4-dihydro-1,4-benzothiazines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02264768A (en) * 1989-04-04 1990-10-29 Ube Ind Ltd Production of 3,4-dihydro-1,4-benzothiazines

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 114, no. 15, 15 April 1991, Columbus, Ohio, US; abstract no. 143434, WATANABE M.: "Preparation of 3,4-dihydro-1,4-benzothiazine derivatives" XP002187711 *
J. L. LENG: "Synthesis and reactivity of 4-substituted-2,3-dihydrobenzo-1,4-thiazines", JOURNAL OF HETEROCYCLIC CHEMISTRY., vol. 19, no. 2, 1982, HETEROCORPORATION. PROVO., US, pages 237 - 240, XP002187710, ISSN: 0022-152X *

Also Published As

Publication number Publication date
AU2001282403A1 (en) 2002-03-22
WO2002020498A2 (en) 2002-03-14

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