Utility of diene-tricarbonyliron complexes as mobile chiral auxiliaries: highly diastereoselective 1,5-nucleophilic substitution with 1,2-migration of the Fe(CO)3 moiety
作者:Yoshiji Takemoto、Naoki Yoshikawa、Chuzo Iwata
DOI:10.1039/c39950000631
日期:——
O-Acyl or O-phosphoryl cyanohydrin derivatives of the tricarbonyliron complex of hexa-2,4-dienal undergo regio- and stereo-selective 1,5-substitution reactions with several heteroatomic nucleophiles giving, with migration of the Fe(CO)3 group, predominantly either (E,E)- or (E,Z)- products by appropriate selection of solvent and acid catalyst.
Stereoselective construction of contiguous stereogenic centers of acyclic compounds by using the Fe(CO)3 moiety as a mobile chiral auxiliary is described. Although the reactions of acyclic (pentadienyl)iron(1+) cations with nucleophiles generally occur in a stereoselective but nonregioselective manner, giving rise to several regioisomers, O-acyl and O-phosphoryl cyanohydrin Fe(CO)3 complexes 2−5 undergo
Three stereogenic centers bearing azide, methoxy, and ethylthio groups, have been constructed stereoselectively using the sole chirality of the Fe(CO)3 group with concurrent 1,2-migration of the Fe(CO)3 group and the obtained product was converted to an anti-aminoalcohol derivative to determine the absolute stereochemistry.