Radical hydrostannylation, pd(0)-catalyzed hydrostannylation, stannylcupration of propargyl alcohols and enynols: region- and steresoselectivities

摘要

Different enynols and propargyl derivativs were submitted to radical hydrostannylation (Bu_3SnH/ AIBN), Pd(0)-catalyzed hydrostannylation [Bu_3SnH/Pd(0), and stannylcupration [Bu_3Sn(R)CuNMLi_2] Conditions. Except for the radical stannylation reaction, high region- and stereoselective formation Of vinyl- and dienylstannanes are obtained. Results are tentatively explained in terms of steric Interactions between the alkyne or enyne substituents and the palladium or cuprate moieties in The different reaction intermediates.