RADICAL HYDROSTANNYLATION, PD(0)-CATALYZED HYDROSTANNYLATION, STANNYLCUPRATION OF PROPARGYL ALCOHOLS AND ENYNOLS - REGIOSELECTIVES AND STEREOSELECTIVITIES
Jf. Betzer et al., RADICAL HYDROSTANNYLATION, PD(0)-CATALYZED HYDROSTANNYLATION, STANNYLCUPRATION OF PROPARGYL ALCOHOLS AND ENYNOLS - REGIOSELECTIVES AND STEREOSELECTIVITIES, Journal of organic chemistry, 62(22), 1997, pp. 7768-7780
Different enynols and propargyl derivatives were sumitted to radical h
ydrostannylation (Bu3SnH/AIBN), Pd(0)-catalyzed hydrostannylation [Bu3
SnH/Pd(0)], and stannylcupration [Bu3Sn(R)CuCNLi2] conditions. Except
for the radical stannylation reaction, high regio-and stereoselective
formation of vinyl-and dienylstannanes are obtained. Results are tenta
tively explained in terms of steric Interactions between the alkyne or
enyne substituents and the palladium or cuprate moieties in the diffe
rent reaction intermediates.