✦ LIBER ✦

Preparation of 4-hydroxy-3-substituted, 2H-1-benzopyran-2-ones and 2H-1-benzothiopyran-2-ones from carboxylic esters and methyl salicylates or methyl thiosalicylate

✍ Scribed by Sharon E. Davis; A. Cameron Church; Rebecca C. Tummons; Charles F. Beam

Publisher: Journal of Heterocyclic Chemistry
Year: 1997
Tongue: English
Weight: 305 KB
Volume: 34
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570340411

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

C(α)‐Carboxylic acid esters were treated with excess lithium diisopropylamide, condensed with methyl salicylates or methyl thiosalicylate, followed by acid cyclization to either 4‐hydroxy‐3‐substituted, 2__H__‐1‐benzopyran‐2‐ones (coumarins), or 2__H__‐1‐benzothiopyran‐2‐ones (thiocoumarins).

📜 SIMILAR VOLUMES

ChemInform Abstract: Preparation of 4-Hy

ChemInform Abstract: Preparation of 4-Hydroxy-3-substituted, 2H-1-Benzopyran-2-ones and 2H-1-Benzothiopyran-2-ones from Carboxylic Esters and Methyl Salicylates or Methyl Thiosalicylate.

✍ S. E. DAVIS; A. C. CHURCH; R. C. TUMMONS; C. F. BEAM 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 29 KB 👁 1 views

Synthesis of Substituted Hydroxyspiro([1

Synthesis of Substituted Hydroxyspiro([1]benzopyran-2,4′(1′H)pyrimidine)-2′(3′H)thiones and Hydroxyspiro([1]benzopyran-2,4′(1′H)pyrimidin)-2′(3′H)ones.

✍ S. I. Filimonov; E. I. Vaganova 📂 Article 📅 2003 🏛 John Wiley and Sons ⚖ 88 KB 👁 1 views

## Abstract For Abstract see ChemInform Abstract in Full Text.

A new preparation of substituted 4H-1-be

A new preparation of substituted 4H-1-benzothiopyran-4-ones from c(α)N-benzoylhydrazones or c(α)N-carboalkoxyhydrazones and methyl thiosalicylate

✍ Kristen L. French; April J. Angel; Angela R. Williams; Douglas R. Hurst; Charles 📂 Article 📅 1998 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 311 KB

13C Nuclear magnetic resonance spectrosc

13C Nuclear magnetic resonance spectroscopy of 4-methylcoumarins (4-methyl-2H-1-benzopyran-2-ones)

✍ V. S. Parmar; S. Singh; P. M. Boll 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 286 KB

substituted 4-methylcoumarins (4-methyl-2H-1 -benzopyran-2-ones) have been recorded. The effects of an alkyl side-chain at C-3 on the chemical shift values and that of a methoxy or an acetoxy group

Regioselective Synthesis of Thiopyrano[3

Regioselective Synthesis of Thiopyrano[3,2-c][1]benzothiopyran-5(2H)-one and Thieno[3,2-c][1]benzothiopyran-4(2H)-one.

✍ K. C. Majumdar; A. K. Pal; M. Ghosh 📂 Article 📅 2007 🏛 John Wiley and Sons ⚖ 25 KB 👁 1 views

ChemInform Abstract: Preparation of Benz

ChemInform Abstract: Preparation of Benz[b]indeno[1,2-e]pyran-11(6H)-ones and Benz[b]indeno[1,2-e]thiopyran-11(6H)-one from Dilithiated 2-Indanone and Lithiated Methyl Salicylates or Lithiated Methyl Thiosalicylate.

✍ Jessica D. Townsend; Angela R. Williams; April J. Angel; Anne E. Finefrock; Char 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 30 KB