Thermodynamic rearrangement of the pentacyclo[5.4.0.02,6.03,10.05,9]undecane skeleton
作者:Kata Mlinarić-Majerski、Jelena Veljković、Alan P. Marchand、Bishwajit Ganguly
DOI:10.1016/s0040-4020(98)00680-2
日期:1998.9
Reaction of pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione (1) with ethanedithiol, when performed in the presence of a Lewis acid catalyst (F3B-OEt2), afforded the corresponding mono(ethylene dithioacetal), 2, along with 7,8-[(thioethano)thio]pentacyclo[6.3.0.02,6.03,10.05,9]undecan-11-one mono(ethylene dithioacetal) (3). Raney nickel reduction of 2 resulted in hydrogenolysis of both the dithioacetal
Enantioselective synthesis of amino acids from pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione
作者:Frans J.C Martins、Agatha M Viljoen、Hendrik G Kruger、Louis Fourie、Justus Roscher、André J Joubert、Philippus L Wessels
DOI:10.1016/s0040-4020(00)01140-6
日期:2001.2
Treatment of (+)-pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8-one with sodium cyanide and ammonium carbonate produced an optically active hydantoin of which the 4′-carbonyl group of the hydantoin ring is in the less sterically hindered equatorial position. Hydrolysis of the latter with barium hydroxide produced (−)-8-amino-pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8-carboxylic acid which has the 1S