Preparation of 3,6-dihydro-2H-pyran-2-carboxylic esters

Details Preparation of 3,6-dihydro-2H-pyran-2-carboxylic esters Preparation of 3,6-dihydro-2H-pyran-2-carboxylic esters

2005-04-26

2005-04-26

Tsang, Cecilia J. (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S425000

Reexamination Certificate

active

06884897

ABSTRACT:
A process is provided for preparing 3,6-dihydro-2H-pyran-2-carboxylic esters via a thermal hetero Diels-Alder reaction of 1,3-dienes with glyoxylic esters without the use of catalysts and stabilizers using a special metering technique.

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Tetrahedron (1993) 49, pp. 4639-4650, Jean Michel Lerestif et al, “Cycloaddition with Stabilized Imidates as Potential Azomethines Ylides : A New Route to 2-Imidazoline and 4-Yliden-5-Imidazolinone.”.
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Robert H et al: “The Carbonyl-Diels-Alder Reaction Catalyzed by Bismuth (III) Chrloride” Tetrahedron Letters, Elsevier Science Bd. 39, Nr. 10, 5. Maerz 1998 (Mar. 5, 1998), Seiten 1161-1164, XPOO4109144 ISSN: 0040-4039 das ganze Dokument.

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