The preparation of (+)- and (−)-12 by resolution of (±)-12 with (R)-N-phenylpantolactam, (R)-13, is described. From (+)- and (−)-12 a series of chiral bisnoradamantane derivatives, whose chirality stems from substitution at the bridgehead positions, have been obtained in both enantiomeric forms.
Dehalogenation of 1,3-Diiodotricyclo[3.3.0.03,7]octane: Generation of 1,3-Dehydrotricyclo[3.3.0.03,7]octane, a 2,5-Methano-Bridged [2.2.1]Propellane
作者:Carles Ayats、Pelayo Camps、José A. Fernández、Santiago Vázquez
DOI:10.1002/chem.200600859
日期:2007.2.2
0(3,7)]octane with molten sodium or tBuLi suggest the intermediate formation of (+/-)-1,3-dehydrotricyclo[3.3.0.0(3,7)]octane. Worthy of note is the formation of stereoisomeric bi(5-methylenebicyclo[2.2.1]hept-2-ylidene) derivatives, probably by coupling of two units of (+/-)-1,3-dehydrotricyclo[3.3.0.0(3,7)]octane of the same or different absolute configuration followed by fragmentation, processes that