Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2006-08-22
2006-08-22
Solola, Taofiq (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
active
07094913
ABSTRACT:
The present invention relates to a synthesis of a 7-membered carbocyclic compound having diexomethylene groups, more particularly to a synthesis of a 7-membered carbocyclic compound having diexomethylene groups, a novel compound having the structure represented by the following Chemical Formula 1, from trimethylsilanylmethyl-allenol derivative by the intramolecular Prins cyclization using Lewis acid. The 7-membered carbocyclic compound is a useful intermediate for synthesis of other multicyclic compounds.In Chemical Formula 1, R1is a C1to C6alkyl group, and R2and R3is respectively a hydrogen atom, or R1, R2and R3may be connected with neighboring substituents to form a 5 to 10-membered aliphatic or aromatic ring.
REFERENCES:
Article “The 91stNational Meeting of the Korean Chemical Society”, ISSN 1229-6708, Apr. 18-19, 2003, p. 363.
Fernando Lopez, et al., “Atom-Efficient Assembly of 1,5-Oxygen-Bridged Medium-Sized Carbocycles by Sequential Combination of a Ru-Catalyzed Alkyne-Alkene Coupling and a Prins-Type Cyclization”, J. Am. Chem. Soc. 2002 American Chemical Society, pp. 4218-4219.
Fouzia Machrouhi, “Sequenced Reactions with Samarium(II) Iodide. A Complementary Annulation Process Providing Access to Seven-, Eight-, and Nine-Membered Carbocycles”, J. Org. Chem. 1999 American Chemical Society, pp. 4119-4123.
Gary A. Molander, et al., “Neighboring Group Participation in Lewis Acid-Promoted [3+4] and [3+5] Annulations. The Stereocontrolled Synthesis of Tricylic Ethers”, J. Org. Chem. 1993, American Chemical Society, pp. 5931-3427.
Dale L. Boger, et al., “Thermal, Four-Carbon + Three-Carbon Cycloaddition Reaction of Cyclopropenone Ketals. Total Synthesis of Deacetamidocolchiceine: Formal Total Synthesis of Colchicine”, J. Org. Chem. 1985 American Chemical Society, pp. 3425-3427.
English Translation of I31P121 on Abstract of The 91stNational Meeting of the Korean Chemical Society Program and Abstracts.
Chang Moon Ho
Cho Yong Seo
Kang Hyun Jung
Koh Hun Yeong
Pae Ae Nim
Beaumont William E.
Korea Institute of Science and Technology
Merchant & Gould P.C.
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