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Synthesis 2006(19): 3243-3249
DOI: 10.1055/s-2006-950230
DOI: 10.1055/s-2006-950230
PAPER
© Georg Thieme Verlag Stuttgart · New York
Vinylphosphonium Salt Mediated Reaction between Alkyl Propiolates and Aminophenols or Hydroxyphenols
Further Information
Received
10 April 2006
Publication Date:
05 September 2006 (online)
Publication History
Publication Date:
05 September 2006 (online)
Abstract
Addition of catechol to methyl propiolate or ethyl phenylpropiolate in the presence of Ph3P leads to methyl 2-(1,3-benzodioxol-2-yl)acetate or 3-(1-phenylmethylidene)-1,4-benzodioxin-2-one. 2-Aminophenols react with alkyl propiolates in the presence of Ph3P to produce a nearly 1:1 mixture of 3-methyl-2H-1,4-benzoxazin-2-one derivatives and methyl (E)-3-(2-aminophenoxy)-2-propenoates.
Key words
alkyl propiolates - triphenylphosphine - hydroxylphenol - aminophenol - benzodioxol - 2H-1,4-benzoxazin-2-one - O-vinylation
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