[GRAPHICS]Palladium-catalyzed hydrostannation of substituted Z- and E-enynols is discussed and compared. The regioselectivity of the H-Sn bond addition was found to be controlled by the geometry of the double bond ( Z- or syn-directing effect) rather than the nature of its substituents. Exclusively alpha-vinyl stannanes were obtained from Z-enynols having various substituents on the double bond regardless of their electronic, steric, or chelating natures.
Myers, Andrew G.; Dragovich, Peter S.; Kuo, Elaine Y., Journal of the American Chemical Society, 1992, vol. 114, # 24, p. 9369 - 9386
作者:Myers, Andrew G.、Dragovich, Peter S.、Kuo, Elaine Y.