Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1997-09-30
1999-05-25
Dentz, Bernard
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C07D30918
Patent
active
059070480
ABSTRACT:
To provide a simple process for economically preparing a dihydropyrane compound at a high productivity and a high reaction yield.
To use a compound selected from the group consisting of a base and a compound (VIII) having a weaker coordination power to the Lewis acid than the aldehyde compound and having an activity to dissolve the Lewis acid, coordinated by the compound (VIII), in a solvent as a co-catalyst in reacting aldehyde with a diene compound in the presence of a Lewis acid to prepare a 5,6-dihydro-2H-pyrane compound represented by formula (III): ##STR1## in which R.sup.1 represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, aryl group which may be substituted with alkyl group, having 6 to 12 total carbon atoms; R.sup.2 and R.sup.3 represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
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Arm. Khm. Zh. (1976), vol. 29, No. 3 pp. 276-277. A Novel Catalyst for the Hetero Diels-Alder Reaction of Aldehydes with Non-Activated Dienes", New Journal of Chemistry, (1995), vol. 19, No. 707, pp. 2-11.
Varinder. K. Aggarwal, et al., "Trifluoromethanesulfonic Acid, An Efficient Catalyst for the Hetero Diels-Alder Reaction and an Improved Synthesis of Mefrosol.", Tetrahedron Letters, vol. 38, No. 14, Apr. 7, 1997, pp. 2569-2572.
Kohama Makoto
Koshino Junji
Nishioka Tohru
Ozawa Tadahiro
Tanaka Shigeyoshi
Dentz Bernard
Kao Corporation
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