Title:
METHOD FOR PRODUCING POTASSIUM SALT OF 3,4-DIHYDRO-1,2,3-OXATHIAZIN-4-ONE-2,2-DIOXIDE COMPOUND
Document Type and Number:
WIPO Patent Application WO/2008/016099
Kind Code:
A1
Abstract:
Disclosed is a method for simply and efficiently producing a high-quality potassium
salt of a 3,4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide compound. Specifically
disclosed is a production method comprising a step wherein a 3,4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide
compound represented by the formula (1) below is subjected to a neutralization
reaction with potassium hydroxide in a mixed solvent of water and a water-soluble
organic solvent, thereby producing a potassium salt of 3,4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide
compound represented by the formula (2) below, while precipitating potassium
sulfate, which is derived from sulfuric acid contained as an impurity in the compound
represented by the formula (1), during the neutralization reaction. (In the
formula, R1 and R2 may be the same or different and represent
a hydrogen atom or an organic group which is inert to the reaction.)
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Inventors:
SAITO, Akira (1-1, Shinko-cho, Myoko-sh, Niigata 50, 9448550, JP)
齋藤 玲 (〒50 新潟県妙高市新工町１－１ ダイセル化学工業株式会社内 Niigata, 9448550, JP)
齋藤 玲 (〒50 新潟県妙高市新工町１－１ ダイセル化学工業株式会社内 Niigata, 9448550, JP)
Application Number:
JP2007/065137
Publication Date:
February 07, 2008
Filing Date:
August 02, 2007
Export Citation:
Assignee:
DAICEL CHEMICAL INDUSTRIES, LTD. (MAINICHI INTECIO, 3-4-5 Umeda, Kita-ku, Osaka-sh, Osaka 01, 5300001, JP)
ダイセル化学工業株式会社 (〒01 大阪府大阪市北区梅田三丁目４番５号 毎日インテシオ Osaka, 5300001, JP)
SAITO, Akira (1-1, Shinko-cho, Myoko-sh, Niigata 50, 9448550, JP)
ダイセル化学工業株式会社 (〒01 大阪府大阪市北区梅田三丁目４番５号 毎日インテシオ Osaka, 5300001, JP)
SAITO, Akira (1-1, Shinko-cho, Myoko-sh, Niigata 50, 9448550, JP)
International Classes:
C07D291/06; C07D291/00
Attorney, Agent or Firm:
GOTO, Yukihisa (Minamimorimachi Kyodo Bldg, 2nd Floor 2-18, Kobai-cho,Kita-ku, Osaka-shi, Osaka 38, 5900038, JP)
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