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Volumn 11, Issue 1, 2007, Pages 30-38

Process development and scale-up of AG035029

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EID: 33847723490     PISSN: 10836160     EISSN: None     Source Type: Journal    
DOI: 10.1021/op0601621     Document Type: Article
Times cited : (17)

References (11)
  • 4
    • 33847753304 scopus 로고    scopus 로고
    • Note: Three mechanistic possibilities were proposed to describe the formation of the key intermediate observed in the kinetic studies. Density functional theory calculations (B3LYP/6-31G(d, were carried out on simpler model systems to explore these mechanisms. The first two mechanisms proposed a rearrangement of the substituent from N2 to N1 of I via a five-membered ring transition state as shown in Figure 10. The computed activation energy barrier (Eact) for this rearrangement was extremely high ∼68 kcal/mol, This can be attributed to the overwhelming strain involved in the five-membered ring transition state to achieve the N2 to N1 rearrangement. Transition structure geometry and activation energy barrier for the proposed N2 to N1 rearrangement via five-membered ring transition state
    • act) for this rearrangement was extremely high (∼68 kcal/mol). This can be attributed to the overwhelming strain involved in the five-membered ring transition state to achieve the N2 to N1 rearrangement. Transition structure geometry and activation energy barrier for the proposed N2 to N1 rearrangement via five-membered ring transition state.


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