1,4-naphthoquinones, XXII: 1,4-addition of 2,6-di-tert-butylphenol to halogenjuglone derivatives

Article abstract of DOI:10.1002/ardp.19923250612

2- and 3-Bromo- or -chloro-5-hydroxy-1,4-naphthoquinone derivatives 1a-d react with 2,6-di-tert-butylphenol and a base by 1,4-addition and HBr/HCl elimination to arylnaphthoquinones of a new type with different regioselectivity. 1a leads to 4 as the main