Carbonyliron Complexation and Carbonyl Insertion of Allenic Ketones
作者:Latchezar S. Trifonov、Alexander S. Orahovats、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.19920750613
日期:1992.10.2
The allenic α-ketones 5a–f give, on irradiation in the presence of [Fe(CO)5], the bis(tricarbonyliron) complexes 6a–f. In the case of ketone 5e, a minor bis(tricarbonyliron) complex with the proposed unique structure 8 is also obtained. Ketones 5a–d, which are disubstituted at C(4), under the same conditions, afford also the lactones 7a–d in moderate yields. The latter reaction is a new carbonyliron-mediated
A tandem thia-Michael/aldolreaction of allenyl esters and mercaptoacetaldehyde in the presence of triethylamine provided 2,3,4-trisubstituted tetrahydrothiophenes. Novel 2,3-disubstituted thiophenes were obtained in high yield by the subsequent dehydration of the 2,3,4-trisubstituted tetrahydrothiophenes using p-toluenesulfonic acid monohydrate as an effective catalyst.