A Novel Synthesis of 1,2,3,4-Tetrahydroquinolines via Pummerer-Type Reaction of N-Aryl-N-((phenylsulfinyl)propyl)formamide.

DOI Web Site Web Site 被引用文献6件 参考文献16件

書誌事項

タイトル別名
  • Novel Synthesis of 1 2 3 4 Tetrahydroquinolines via Pummerer-Type Reaction of N Aryl N phenylsulfinyl propyl formamide
公開日
1999
DOI
  • 10.1248/cpb.47.1269
公開者
公益社団法人 日本薬学会

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説明

A synthesis of 1, 2, 3, 4-tetrahydroquinolines (TQs) 13 with two and three methoxyl groups on the benzene ring, was achieved via intramolecular cyclization of N-aryl-N-[(phenylsulfinyl)propyl]formamides 7 utilizing the Pummerer reaction as a key step. The reaction was carried out by using trifluoroacetic anhydride (TFAA)(method A) or TFAA-BF3·Et2O (method B). The cyclization to 4-PhSTQs 8 proceeded effectively when the reaction center at the benzene ring was electronically activated by a methoxyl group. In the reaction of sulfoxide 7e having two OMe groups in the ortho- and para-positions, a different cyclization reaction leading to 1, 5-benzothiazepine derivative 9 was observed, indicating that the high uncleophilicity of the benzene ring caused the unexpected reaction prior to cyclization to 4-PhSTQs 8. This route starting from methoxyanilines provides an efficient and convenient method of TQ synthesis.

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