Palladium(II)-Catalyzed S<sub>N</sub>2‘ Reactions of α-Allenic Acetates. Stereoconvergent Synthesis of (<i>Z</i>,<i>E</i>)-2-Bromo-1,3-dienes
作者:Attila Horváth、Jan-E. Bäckvall
DOI:10.1021/jo015950x
日期:2001.11.1
The reaction of acetylated a-allenic alcohols with LiBr in the presence of 1.5 mol % of Pd(OAc)(2) provides easy access to substituted (Z,E)-2-bromo-1,3-dienes in good yields with excellent diastereoselectivity. Both secondary and tertiary acetates as well as terminal and nonterminal allenes were studied to investigate the scope and the limitations of the reaction. A mechanism is proposed to clarify how a diastereomeric mixture of the starting compound is transformed into a single diastereomer of the product.
Olsson,L.-I. et al., Acta Chemica Scandinavica (1947), 1973, vol. 27, p. 1629 - 1636
作者:Olsson,L.-I. et al.
DOI:——
日期:——
Gold(I)-Catalyzed Isomerization of Allenyl Carbinol Esters: An Efficient Access to Functionalized 1,3-Butadien-2-ol Esters
作者:Andrea K. Buzas、Florin M. Istrate、Fabien Gagosz
DOI:10.1021/ol063031t
日期:2007.3.1
A study concerning the gold(I)-catalyzed rearrangement of diversely substituted allenyl carbinol esters into functionalized 1,3-butadien-2-ol esters is described. The mild conditions employed allow the efficient, rapid, and stereoselective synthesis of a variety of such compounds via a new 1,3-shift of an ester moiety onto a gold-activated allene. [structure: see text]