Tetrahedron letters

Cobalt π-cations in carbocyclic ring constructions

GB Gill, G Pattenden, GA Roan

Index: Gill, G. Bryon; Pattenden, Gerald; Roan, Graeme A. Tetrahedron Letters, 1996 , vol. 37, # 52 p. 9369 - 9372

Full Text: HTML

Citation Number: 25

Abstract

In a combination of cobalt-mediated cationic and free radical chemistry, treatment of the allyl silane substituted β-hydroxycobaloxime 13 with pTSA led predominantly to the trans- disubstituted cyclopentane 14, which on irradiation with TEMPO produced 15. In a similar manner, the cobaloxime 18 was cyclised to 19 in the presence of pTSA which, on irradiation with a sunlamp then underwent radical mediated cyclisation to the substituted indane 20.

Stereoselective total syntheses of (−)-desoxoprosopinine and (−)-desoxoprosophylline: palladium (O)-catalyzed intramolecular N-alkylation for the key piperidine ring …

[Takao; Nigawara; Nishino; Takagi; Maeda; Tadano; Ogawa Tetrahedron, 1994 , vol. 50, # 19 p. 5681 - 5704]

Dimethylboron bromide and diphenylboron bromide: cleavage of acetals and ketals

[Guindon, Yvan; Yoakim, Christiane; Morton, Howard E. Journal of Organic Chemistry, 1984 , vol. 49, # 21 p. 3912 - 3920]

Simple designs for the construction of complex trans-fused polyether toxin frameworks. A linear strategy based on entropically favored oxirane ring enlargement in …

[Alvarez, Eleuterio; Diaz, Maria T.; Perez, Ricardo; Ravelo, Jose L.; Regueiro, Alicia; et al. Journal of Organic Chemistry, 1994 , vol. 59, # 10 p. 2848 - 2876]