Polycyclic Hydroxyquinones. Part 31. Regioselective Reactions of 6-Ethylsulfonyl-3-phenylfuro[3,4-d]isoxazol-4(6H)-one Anion with Quinone Monoketals. Application to the Preparation of Heteroanthracyclinone Analogues
Regioselective synthesis of 1,8-dihydroxytetralins through a tandem reduction/intramolecular hydroxyalkylation of 4-(3-hydroxyphenyl)alkanoates
摘要:
A series of 4-(3-hydroxyphenyl)butanoates 3 has been prepared and transformed into 1,8-dihydroxytetralins of general formula 2 by treatment with 2 equivalents of DIBALH followed by quenching with aqueous NH4Cl. A possible mechanism for this novel totally regioselective intramolecular hydroxyalkylation is suggested and the factors affecting the stability of 1,8-dihydroxytetralins 2 are also discussed.