Compounds having a disubstituted acetylene moiety and retinoic a

Details Compounds having a disubstituted acetylene moiety and retinoic a Compounds having a disubstituted acetylene moiety and retinoic a

1989-09-19

1991-06-11

Waddell, Frederick E.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D33506

Patent

active

050233416

ABSTRACT:
Disubstituted acetylene thiochroman containing derivatives of the formulae below wherein the symbols have the following meanings; R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen or lower alkyl groups (of 1-6 carbons) where R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 may be identical or different from one another) X is S ##STR1##

REFERENCES:
patent: 4739098 (1988-04-01), Chandraratna
patent: 4810804 (1989-03-01), Chandraratna
A General Synthesis of Terminal and Internal Arylalkynes by the Palladium-Catalyzed Reaction oof Alkynylzinc Reagents with Aryl Halides, by Anthony O. King and Ei-ichi Negishi, J. Org. Chem, 43 1978, p. 358.
A Convenient Synthesis of Ethynylarenes and Diethynylarenes, by S. Takahashi, Y. Kuroyama, K. Sonogashira, N. Hagihara, Synthesis 1980, pp. 627-630.
Conversion of Methyl Ketones into Thermal Acetylenes and (E)-Trisubstituted Olefins of Terpenoid Origin, by Ei-ichi, Anthony O. King, and William L. Klima, J. Org. Chem. 45 1980, p. 2526.

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