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ChemInform Abstract: 1-Alkyl-3,4-dihydro-thienopyran Acids and 1-Alkyl-3,4-dihydro-benzo[b]thienopyran Acids.

โœ Scribed by B. Unterhalt; N. Kissenbeck

Publisher
John Wiley and Sons
Year
2010
Weight
34 KB
Volume
30
Category
Article
ISSN
0931-7597

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โœฆ Synopsis

pyran derivatives pyran derivatives R 0340 42 -143 1-Alkyl-3,4-dihydro-thienopyran Acids and 1-Alkyl-3,4-dihydrobenzo[b]thienopyran Acids. -Ring closure of thienylethanols (I) and (IV) as well as their benzo analogues (VI) and (VIII) is achieved with oxo esters (II). The best results are obtained with 48% BF 3 โ€ขEt 2 O. Besides BF 3 โ€ขEt 2 O, HCl and TosOH are acceptable reagents. No antiphlogistic effects are observed. -

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ChemInform Abstract: Activation of the 4
ChemInform Abstract: Activation of the 4-Oxo Function in 1-Alkyl-1,4-dihydro-4-oxoquinoline-3-carboxylic Acids with Thionyl Chloride.
โœ T. VAN ES; B. STASKUN ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› John Wiley and Sons โš– 33 KB ๐Ÿ‘ 1 views

Activation of the 4-Oxo Function in 1-Alkyl-1,4-dihydro-4oxoquinoline-3-carboxylic Acids with Thionyl Chloride. -Treatment of the title acids (I) with SOCl 2 and subsequently with amines (II) affords the hitherto unknown 4-imino acids (III) and/or the 4-imino amides (IV) instead of the expected 4-o