substrates 1 and 2 can be regioselectively converted into chiral allenyl alcohols 3 through the title reaction [Eq. (1)] with the synergetic reagent iPrSBEt2 and a chiral TiIV catalyst. The dramatic regioselectivity originates from the regulation of the equilibriumbetween propargyl- and allenylstannanes during the catalytic process.
Practical and efficient catalytic asymmetric allylic transfer reactions of achiral aldehydes with tin reagents promoted by BINOL-Ti(IV) complex are achieved with high enantioselectivity by the utilization of subjoined Lewis acid, B(OMe)3.
Efficient catalytic asymmetric prop-2-ynylation of achiral aldehydes
with allenyltributylstannane promoted by a BINOL–Ti
IV
complex (10 mol%) is achieved with high enantioselectivity by the use of
Et
2
BSPr
i
.
通过使用 Et 2 BSPr i,在 BINOL-Ti IV 复合物(10 mol%)的促进下,以高对映选择性实现了不对称丙-2-炔基与全烯基三丁基锡烷的高效催化。