A Highly Atom Efficient, Solvent Promoted Addition of Tetraallylic, Tetraallenic, and Tetrapropargylic Stannanes to Carbonyl Compounds
作者:Adam McCluskey、I. Wayan Muderawan、Muntari、David J. Young
DOI:10.1021/jo015904x
日期:2001.11.1
Tetraallylic, tetraallenic, and tetrapropargylic stannanes (0.25 equiv) react with aldehydes in methanol to provide unsaturated alcohols in good to excellent yields (56-99%). These reactions proceed exclusively with allylic rearrangement for tetra(2-butenyl)tin 2b and tetra(1,2-butadienyl)tin 16c and predominantly with allylic rearrangement for tetrapropadienyltin 16a and tetra(2-butynyl)tin 6e. Allylation. reactions also proceeded smoothly with reactive ketones such as ethyl pyruvate (9a) and cyclohexanone (9b). The corresponding TFA-catalyzed reactions of dimethyl acetals 4d and 4e are regiospecific with allylic rearrangement.
In-MEDIATED ALLYLATION OF α-KETO ESTERS WITH ALLYL HALIDES<sup>*</sup>
作者:Phil Ho Lee、Kooyeon Lee、Sukbok Chang
DOI:10.1081/scc-100105896
日期:2001.1
The chemoselective reaction of α-keto esters with allyl halides, propargyl bromides, and allenyl bromide using indium metal afforded α-hydroxy-γ,δ-unsaturated esters in good to excellent yields under mild conditions. *This paper is dedicated to Professor Chang Hwan Rhee on the occasion of his 60th birthday.