A singular substituent effect in the nickel(0) mediated cocyclisation of octa-1,7-diynes with alkynols. One-step synthesis of tetralin lactones from acyclic precursors
A singular substituent effect in the nickel(0) mediated cocyclisation of octa-1,7-diynes with alkynols. One-step synthesis of tetralin lactones from acyclic precursors
作者:Parveen Bhatarah、Edward H. Smith
DOI:10.1039/c39910000277
日期:——
Whereas the reaction of simple octa-1,7-diynes is fruitless, those bearing ester groups on the terminal positions react with alkynols in the presence of stoichiometric amounts of a nickel(0) reagent derived from NiCl2(PPh3)2 and BunLi to give tetralin lactones in moderate to good yields.
Nickel(0)-promoted synthesis of tetralin lactones from the co-cyclisation of monoynes and octa-1,7-diynes terminally substituted with ester or amide groups
作者:Parveen Bhatarah、Edward H. Smith
DOI:10.1039/p19920002163
日期:——
The co-cyclisation of octa-1,7-diynes with a variety of monoynes mediated by nickel(0) requires ester or amide groups at the terminal positions of the diyne and is subject to steric hindrance about the diyne rather than the monoyne; fused tetralin lactones are the most common products obtained in moderate to good yields. Intramolecular cyclisation of two triynes to the same type of product gives superior yields.