Tin-Hydride-Mediated Radical Addition of Alkyl Halides to 2-Methylene-1,3-dithiane Monoxide as a Ketene Equivalent
作者:Hideki Yorimitsu、Koichiro Oshima、Suguru Yoshida
DOI:10.3987/com-09-s(s)6
日期:——
Reductive radical addition of alkyl halides to ketene dithioacetal monoxide in the presence of tributyltin hydride and a radical initiator provides the corresponding adducts, 2-alkyl-1,3-dithiane monoxides, in good yields.
Conversion of 3,3,3-Trisubstituted Prop-1-ynes with <i>tert</i>-Butylhydrazine into 3,3,3-Trisubstituted Propionitriles Catalyzed by TpRh(C<sub>2</sub>H<sub>4</sub>)<sub>2</sub>/P(2-furyl)<sub>3</sub>
tris(pyrazol-1-yl)borate) and P(2-furyl)3 catalyzes the reaction of tertiary alkyl-substituted alkynes with tert-butylhydrazine, leading to the formation of 3,3,3-trisubstituted propionitrile derivatives. This reaction system is applicable to 1,1-disubstituted propargyl alcohols and amines to afford the corresponding β-cyanohydrins and β-amino nitriles, respectively. The catalytic cycle involves the formation
TpRh(C 2 H 4)2(Tp =三(吡唑-1-基)硼酸酯)和P(2-呋喃基)3的组合催化叔烷基取代的炔烃与叔丁基肼的反应,导致形成3,3,3-三取代的丙腈衍生物。该反应体系适用于1,1-二取代的炔丙醇和胺,分别得到相应的β-氰醇和β-氨基腈。催化循环涉及形成乙烯基亚乙基络合物作为关键中间体。
Radical Addition of Alkyl Halides to 2-Methylene-1,3-dithiane Monoxide as a Ketene Equivalent
Radicaladdition reaction of alkyl halides with ketene dithioacetal monoxide in the presence of tributyltin hydride and a catalytic amount of 2,2'-azobis(isobutyronitrile) (AIBN) proceeds smoothly to provide the corresponding adducts in moderate to high yields.