[EN] FUSED 6,5 BICYCLIC RING SYSTEM P2 LIGANDS, AND METHODS FOR TREATING HIV [FR] LIGANDS P2 À SYSTÈME CYCLIQUE 6,5 BICYCLIQUE FUSIONNÉ, ET PROCÉDÉS DE TRAITEMENT D'UNE INFECTION PAR LE VIH
3-Triethylsilyloxypentadienyllithium, a Versatile 1,3-Diene- or Vinyl Ketone-Building Block
作者:Wolfgang Oppolzer、Roger L. Snowden、Dana P. Simmons
DOI:10.1002/hlca.19810640705
日期:1981.11.4
(Table 1) aldehydes and ketones attack preferentially the γ-position of 4(Table 2). The desired γ-products 6 may be directly subjected to inter- and intramolecular [4 + 2]-additions as demonstrated by the reactions 5a ( 6d) 7 and 6h 19(Schemes 4 and 12). Alternatively, smooth fluoride-promoted silylether-cleavage 6 11(Scheme 8) provides a convenient approach to substituted vinyl ketones such as to
Iminium Ion–Enamine Cascade Cyclizations: Facile Access to Structurally Diverse Azacyclic Compounds and Natural Products
作者:Stephen Hanessian、Amit Kumar Chattopadhyay
DOI:10.1021/ol403229q
日期:2014.1.3
A one-pot, mild, two-component iminium ion–enamine cascade reaction to construct structurally diverse azacyclic frameworks from l-proline and l-pipecolic acid, and its application to indolizidine and quinolizidine alkaloids and azasteroids, is reported.
Preparation and reactivity of bridge-substituted bicyclo[3.2.1]octyl and bicyclo[3.3.1]nonyl toluenesulfonates
作者:C.S. Foote、R.B. Woodward
DOI:10.1016/s0040-4020(01)98630-2
日期:1964.1
Endo- and exo-bicyclo[3.2.1]octyl-8-tosylate (III and IV) and bicyclo[3.3.1]nonyl-9-tosylate (V) have been prepared by a novel synthetic sequence. In acetolysis, the relative rates are: III, 7·8 × 10−5; IV, 6·1 × 10−1; V, 3·0; for comparison, the rate of norbornyl-7-tosylate (I) is 9·1 × 10−8, and that of cyclohexyl tosylate (II) is 1·00. The solvolyses of IV and V are anchimerically accelerated. V
Sequential radical macrocyclisation-transannulation approach to ring-fused bicycles
作者:Gerald Pattenden、Allison J. Smithies、Daryl S. Walter
DOI:10.1016/0040-4039(94)85233-2
日期:1994.4
The scope for tandem radical mediated macrocyclisation-transannulation processes (Scheme 1) in the elaboration of polycycles is illustrated with the facile syntheses of linear 5,6-, 6,6- and 5,7-ring fused carbobicycles, viz7, 8, 11, 13 from appropriate iododienone precursors, viz1, 2, 12 on treatment with Bu3SnH-AIBN.
Stéréosélectivité de l'addition de réactifs nucléophiles sur des cétones polycycliques à jonction trans
作者:D. Calmes、L. Gorrichon-Guigon、P. Maroni、A. Accary、R. Barret、J. Huet
DOI:10.1016/s0040-4020(01)97654-9
日期:1981.1
The nucleophilic additions of hindered organometallic compounds to polycyclic ketones with trans ring junctions involve predominant axial attack when flattening of the ring containing the carbonyl group occurs. The influence of nucleophile structure (O-Por C-metallated character) on equatorial or axial attack is discussed.