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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 25, 1995 - Issue 5
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Original Articles

Metalated Aromatic Carboxylic Acids: Improved Synthesis of SDZ HUL412

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Pages 667-680 | Received 16 Aug 1994, Published online: 23 Sep 2006

References

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  • The lithium toluate was observed precipitating out of the THF solution.
  • Seebach , D. , Henning , R. and Mukhopadhyay , T. 1982 . Chem Ber. , 115 : 1705
  • Seebach , D. and Mukhopadhyay , T. 1982 . Helv. Chim. Acta. , 65 : 39
  • HMPA is a known carcinogen (see reference 7 and citations therein)
  • The overall yield determined from Table I, entry 1 is 59%.
  • Japan Patent #58032839 . 1983 . Early studies were carried out with commercially available 3,4,5-trimethoxybenzyl chloride (Fluka). Because of the high cost of this reagent, an in-house syhthesis was developed (see experimental section). For reported preparations of this reagent see: Otsuka Pharmaceuticals Co. LTD.
  • Garzio , A. , Vitladino , G. , Bottazzi , A. , Pelagalli , D. and Coccoli , C. US Patent #4273931 . 1981 .
  • French Patent # 2228064 .
  • Abdel-R. , M. , Aboul-Enein , M. N. and Taha , R. M. 1968 . J. Chem. U.A.R. , 11 ( 3 ) : 401 The reactions presented in Table II were conducted with 3,4,5-trimethoxybenzyl chloride prepared in-house.
  • The overall yield of methyl ester 2 determined from Table II, entry 2 is 50%.
  • Further development of this reaction sequence for large scale applications is currently under investigation and the results will be reported at a later date.
  • The authors wish to thank Mr. Jerome Linder for his contribution in the hydrogenation reaction . 4 to 2

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