Enantioconvergent Hydroboration of a Racemic Allene: Enantioselective Synthesis of (<i>E</i>)-δ-Stannyl-<i>anti</i>-homoallylic Alcohols via Aldehyde Crotylboration
作者:Ming Chen、William R. Roush
DOI:10.1021/ja2010187
日期:2011.4.20
The enantioconvergent hydroboration of racemic allenylstannane (+/-)-1 with ((d)Ipc)(2)BH converts both enantiomers of (+/-)-1 into the enantioenriched crotylborane (S)-E-3. Subsequent crotylboration of aldehydes with (S)-E-3 provides (E)-stannyl-homoallylic alcohols 5 in good yields and with excellent enantioselectivity.