Convenient Synthesis of 1,4-Thiazane-3-carboxylic Acid Derivatives
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概要
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A convenient method to synthesize 1,4-thiazane-3-carboxylic acid derivatives was established. Condensation of L-cysteine methyl ester (2a) with monochloroacetone (3a) followed by reduction with sodium borohydride yielded methyl (3R, 5S)-5-methyl-1,4-thiazane-3-carboxylate (6a) and its (5R)-methyl isomer (7a) in a ratio of 3.1 : 1. The use of cysteine isopropyl ester (2c) instead of methyl ester (2a) gave the corresponding (5S)-methyl isomer (6e) more stereoselectively. The reaction of chloromethyl ethyl ketone (3b) or α-bromoacetophenone (3c) with 2a gave the corresponding 5-substituted-1,4-thiazane-3-carboxylates. Hydrolysis and oxidation of 6a yielded cycloalliin (1a).
- 1981-06-25
著者
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米田 直人
Research Laboratory of Applied Biochemistry, Tanabe Seiyaku Co., Ltd.
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米田 直人
Research Laboratory Of Applied Biochemistry Tanabe Seiyaku Co. Ltd.
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坂井 和夫
Research Laboratory of Applied Biochemistry Tanabe Seiyaku Co., Ltd.
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坂井 和夫
Research Laboratory Of Applied Biochemistry Tanabe Seiyaku Co. Ltd.
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米田 直人
Research Laboratory of Applied Biochemistry
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米田 直人
Research Laboratory of Applied Biochemistry Tanabe Seiyaku Co., Ltd.
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