Novel 2,4-disubstituted pyran derivatives, their preparation and

Details Novel 2,4-disubstituted pyran derivatives, their preparation and Novel 2,4-disubstituted pyran derivatives, their preparation and

1980-05-30

1981-09-29

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603458R, 2603459R, 252522R, C07D30920, C07D30924, C07D30926, C07D30922

Patent

active

042922445

ABSTRACT:
2-(1-methyl-eth-1-en-1-yl)-,2-(1-methyl-prop-1-en-1-yl)-, 2-(eth-1-en-1-yl)- and 2-(prop-1-en-1-yl)-4-methyl-2,3-dihydro-6H-pyrans substituted in the 2-position of the side chain by hydroxymethyl, acyloxymethyl, alkoxycarbonylmethyl, halomethyl or formyl. The novel 4-methyl-2,3-dihydro-6H-pyrans are obtained by reaction of 3-methyl-but-3-en-1-ol with an appropriately substituted unsaturated aldehyde in the presence of an acid catalyst. The products possess very interesting organoleptic properties.

REFERENCES:
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patent: 4070491 (1978-01-01), Vinals et al.
patent: 4071535 (1978-01-01), Vinals et al.
Muhlstadt et al., Zeits. Chem., 11, 459 (1971).
Williams et al., Jacs, 72, 5738 (1950).
Hudson et al., Tetrahedron, 1957, vol. 1, pp. 284-288.
Derwent Pharmdoc 29159T-DE of Japanese Published Patent Application JA-PS 7214383, 2-13-70.
Amano et al., C. A. 77, 48243y and 48244z, (1972).
Patents Abstracts of Japan, vol. 1, No. 64, p. 889 C 77 (1977).

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