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Synthese von einigen 2 H ‐Pyran‐2‐on‐Derivaten
Author(s) -
Kvita Vratislav,
Sauter Hanspeter
Publication year - 1990
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19900730414
Subject(s) - pyran , chemistry , stereochemistry , trifluoromethyl , organic chemistry , alkyl
The Synthesis of Some 2 H ‐Pyran‐2‐one Derivatives Derivatives of 6‐unsubstituted 2 H ‐pyran‐2‐one have been synthesized by several different methods. The 4‐chloro‐2 H ‐pyran‐2‐one ( 9 ) is the most important, since it serves as starting material for the synthesis of different 4‐substituted 2 H ‐pyran‐2‐ones ( Scheme 2 ). Also described are simple transformations of cumalic‐acid derivatives producing 5‐(2,2‐dichlorovinyl)‐2 H ‐pyran‐2‐one ( 23 ), 2‐oxo‐2 H ‐pyran‐2‐carbonitrile ( 26 ), and 4,5‐bis(trifluoromethyl)‐2 H ‐pyran‐2‐one ( 32 ) ( Scheme 3 and 4 ).