Pd(0)-catalyzed selective [2 + 2 + 2] cycloaddition of dimethyl nona- 2,7-diyne-1,9-dioate derivatives with dimethyl acetylenedicarboxylate

Tetrahedron Letters

Volumn 40, Issue 27, 1999, Pages 5035-5038

  Yamamoto, Yoshihiko ^a   Nagata, Asako ^a   Itoh, Kenji ^a  

^a NAGOYA UNIVERSITY   (Japan)

Author keywords

Alkynes; Bicyclic aromatic compounds; Cycloadditions; Palladium catalyst

Indexed keywords

ACETYLENE; DICARBOXYLIC ACID; PALLADIUM;

ARTICLE; CATALYSIS; CHEMICAL REACTION; CYCLIZATION; MOLECULAR INTERACTION; STRUCTURE ANALYSIS;

EID: 0033516521     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(99)00927-2     Document Type: Article

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22. 9: C, 54.55; H, 4.58. Found: C, 54.29; H, 4.56.
23. 3 (3.7 mg, 0.014 mmol) and DMAD (45 mg, 0.32 mmol), and the suspension was stirred for 30 min at 110 °C. The resultant brown solution was concentrated in vacuo and the residue was purified by silica gel chromatography (hexane : AcOEt = 4 : 1) to afford the phthalan 4a (79 mg, 78%) as colorless solids.
24. 6, 60.43; H, 5.07. Found: C, 60.30; H, 4.99.