148843-77-0Relevant articles and documents
Concise Process for Pyriftalid Synthesis by Introducing the Mercapto Group Directly from a Nitro Group
Li, Zhong,Chi, Yong-Jian,Huang, Yi-Wen
, p. 307 - 312 (2022/02/01)
A concise and efficient process for the synthesis of pyriftalid is described herein. The improved process features the direct introduction of the mercapto group by one-step substitution of a nitro group using sodium sulfide and elemental sulfur. A systematic study of the key step is also carried out in this article. Compared with previous routes, the optimized route is shorter and avoids a hazardous catalytic reduction and a subsequent diazotization reaction. Salt waste generated in workup is reduced as well. Pyriftalid is obtained in 68% overall yield and 99.88% purity in five steps with 3-nitrophthalic acid as the starting material.
Method for the preparation of 2-amino-6-ethylbenzoic acid
-
Page/Page column 6-7, (2011/05/08)
The present invention relates to a novel method for the production of 2-amino-6-ethylbenzoic acid wherein 7-amino-3-methylphtalide or 7-amino-3-hydroxy-3-methylphtalide is reduced to 2-amino-6-ethylbenzoic acid in water or in a mixture of a water miscible
7-(4,6-dimethoxypyrimidinyl)oxy- and -thiophthalides as novel herbicides: Part 1. CGA 279 233: A new grass-killer for rice
Luethy, Christoph,Zondler, Helmut,Rapold, Thomas,Seifert, Gottfried,Urwyler, Bernhard,Heinis, Thomas,Steinruecken, Hans Christian,Allen, James
, p. 205 - 224 (2007/10/03)
A series of novel types of 7-(4,6-dimethoxypyrimidin-2-yl)oxy - and -thio-3-methyl-1 (3H)-isobenzofuranones were discovered at Dr R Maag AG. From the thio-isobenzofuranyl series, CGA 279 233 - BSI-proposed common name pyriftalid - was chosen for further development as a grass herbicide for use in rice. General synthetic approaches to these new phthalic acid-derived compounds are given, with emphasis on the synthesis of pyriftalid and its physico-chemical behaviour.