Diastereoselective synthesis of the first 2,3,4-trisubstituted platina(IV)cyclobutanes
作者:W. D. Neilsen、R. D. Larsen、P. W. Jennings
DOI:10.1021/ja00218a054
日期:1988.5
Synthese a partir du norbornene-2, de N 2 CHCO 2 Et, de Pd(OAc) 2 et de Pt(II) d'un complexe metallocyclique (tricyclique) du platine IV. Sa structurecristalline est etudiee. Ce complexe reagit ensuite avec le diazomethane pour donner de facon stereospecifique au niveau des deux centres allyliques un vinyl-3' cyclopentyl-3 propene-2ol-1
合成 a partir du norbornene-2, de N 2 CHCO 2 Et, de Pd(OAc) 2 et de Pt(II) d'un complexe metallocyclique (tricyclique) du platine IV。Sa 结构 cristalline est etudiee。Ce complexe reagit ensuite avec le diazomethane pour donner de faconstereospecifique au niveau des deux center allyliques unvinyl-3' cyclopentyl-3 propene-2ol-1
Synthesis of 1,3-divinylcyclopentane derivatives from platina(IV)cyclobutane complexes
作者:F. F. Stewart、W. D. Neilsen、R. E. Ekeland、R. D. Larsen、P. W. Jennings
DOI:10.1021/om00035a050
日期:1993.11
A new transformation is reported in which a norbornyl-substituted platina(IV)cyclobutane complex is reacted with selected diazo derivatives to yield cis-1,3-divinylcyclopentane products in excellent yields. The distal substituent on one vinyl moiety is formed stereospecifically, while the substituent on the other vinyl moiety is not. Mechanistic details suggest a specific binding site for the diazo derivative leading to formation of a metallacyclopentane intermediate which spontaneously yields the divinyl product. The first crystal structure of a platina(IV)-cyclobutane bearing an electron-withdrawing aldehyde functionality is also included.