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Volumn 14, Issue 23, 2012, Pages 5856-5859

Rhodium-catalyzed one-pot intermolecular [2 + 2 + 2] trimerization/ asymmetric intramolecular [4 + 2] cycloaddition of two aryl ethynyl ethers and 5-alkynals

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EID: 84870906820     PISSN: 15237060     EISSN: 15237052     Source Type: Journal    
DOI: 10.1021/ol3027158     Document Type: Article
Times cited : (18)

References (71)
  • 69
    • 77955911241 scopus 로고    scopus 로고
    • Evans, P. A. Wiley-VCH: Weinheim, Germany
    • For a review of the Rh-catalyzed [4 + 2] carbocyclization, see: Robinson, J. E. In Modern Rhodium-Catalyzed Organic Reactions; Evans, P. A., Eds.; Wiley-VCH: Weinheim, Germany, 2005; p 241.
    • (2005) Modern Rhodium-Catalyzed Organic Reactions , pp. 241
    • Robinson, J.E.1
  • 70
    • 77950339390 scopus 로고    scopus 로고
    • In the reactions of Table 1, the homo-[2 + 2 + 2] cycloaddition of 1a leading to benzene 7 and the homodimerization of 2a leading to ester 8 were observed as side reactions. For the formation of 8, see: Tanaka, R.; Noguchi, K.; Tanaka, K. J. Am. Chem. Soc. 2010, 132, 1238
    • (2010) J. Am. Chem. Soc. , vol.132 , pp. 1238
    • Tanaka, R.1    Noguchi, K.2    Tanaka, K.3
  • 71
    • 34250636379 scopus 로고    scopus 로고
    • A possible explanation for the formation of two diastereomers 4ag and 4ag ′ is as follows. At rt, the reaction of 1a and 2g affords E -dienyne 3ag as a predominant stereoisomer. At 80 C, equilibration between E -dienyne 3ag and Z -dienyne 3ag ′ occurs in the presence of the cationic Rh(I) catalyst. (For the cationic Rh(I) complex-catalyzed E / Z isomerization of enones, see: Tanaka, K.; Shoji, T.; Hirano, M. Eur. J. Org. Chem. 2007, 2687.) Although E -dienyne 3ag may be thermodynamically more stable, the cyclization of 3ag may be slow as a result of the steric interaction between the methyl and aryloxyvinyl groups in intermediate F. In contrast, the cyclization of thermodynamically less stable Z -dienyne 3ag ′ may be fast as a result of the formation of less sterically demanding intermediate F ′. The formation of 4ag and 4ag ′ through different rhodacycles F and F ′, respectively, is consistent with their different ee values
    • (2007) Eur. J. Org. Chem. , pp. 2687
    • Tanaka, K.1    Shoji, T.2    Hirano, M.3


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.