intramolecular allylation reactions of furan and thiophene were performed using a cationic cyclopentadienyl-ruthenium (CpRu) complex of a chiral pyridine carboxylic acid, namely Cl-Naph-PyCOOH. Both furan and thiophene tethered with an allylic alcohol gave the corresponding bicyclic compounds in high yields and enantioselectivities using 0.1–5 mol% of the catalyst. The reaction was found to proceed via
Manganese(III) acetate initiated oxidative free radical reaction between 1,4-naphthoquinones and α-alkylmalonates
作者:Che-Ping Chuang、Sheow-Fong Wang
DOI:10.1016/s0040-4020(98)00622-x
日期:1998.8
The manganese(III) initiatedoxidativefreeradicalreactionbetween 1,4-naphthoquinones and α-alkylmalonates is described. Benzo[a]anthraquinones, benzo[f]indole-4,9-diones and naphtho[2,3-b] furan-4,9-diones can be prepared effectively from readily available 1,4-naphthoquinones and α-alkylmalonates.