REGIOSELECTIVE AND STEREOSELECTIVE SYNTHESIS OF POLYENIC VINYLTIN ACETALS - THE UNEXPECTED EFFECT OF THE NATURE OF A REMOTE ACETAL FUNCTIONON THE REGIOSELECTIVITY OF THE STANNYLMETALLATION
F. Suzenet et al., REGIOSELECTIVE AND STEREOSELECTIVE SYNTHESIS OF POLYENIC VINYLTIN ACETALS - THE UNEXPECTED EFFECT OF THE NATURE OF A REMOTE ACETAL FUNCTIONON THE REGIOSELECTIVITY OF THE STANNYLMETALLATION, Synlett, (8), 1998, pp. 879
Stannylmetallation of protected enynals with Bu3Sn(Bu)CuCNLi2 has been
proved to be highly dependent on the substrate and on the experimenta
l conditions. (2E,4E)-5-Tributylstannylpenta-2,4-dienal acetal was obt
ained as a nearly pure isomer when ethylene glycol acetal was used as
a protecting group with a 0.28 M stannyl anion concentration.