Enantioselective Synthesis of (<i>Z</i>)- and (<i>E</i>)-2-Methyl-1,5-<i>anti</i>-Pentenediols via an Allene Hydroboration–Double-Allylboration Reaction Sequence
作者:Ming Chen、William R. Roush
DOI:10.1021/ja4033633
日期:2013.6.26
allenylboronate 5 followed by double allylboration with the resulting allylborane (Z)-7 gave (Z)-2-methyl-1,5-anti-pentenediols 6 in good yield and high enantioselectivity in the presence of 10% BF3·OEt2 as the catalyst in the second allylboration step. Under thermodynamically controlled isomerization conditions, (Z)-7 can readily isomerize to (E)-7. Double allylboration of representative aldehydes