A versatile synthesis of (E)- and (Z)-1-halo-2-(alkoxymethyl)-1,3-butadienes and their condensation with aldehydes
作者:Timothy Wong、Michael W. Tjepkema、Hélène Audrain、Peter D. Wilson、Alex G. Fallis
DOI:10.1016/0040-4039(95)02303-8
日期:1996.2
direct synthesis of various stereodefined dienes 4–11 from propargyl alcohols upon direct addition of vinylmagnesium chloride and manipulation of the resulting magnesium chelate 3 is described. These halo-dienes provided access to the corresponding dienyllithium reagents which were condensed with the aldehydes 13, 15, 17, and 19 to provide the secondary alcohols 14, 16, 18, 20, and 21, respectively
Synthesis of (E)- and(Z)-1-(Trimethylsilyl)-2-(siloxymethyl)-1,3-butadienes: Versatile Building Blocks for Diels-Alder Cycloadditions Including an Approach toward Taxoids
作者:Timothy Wong、Miguel A. Romero、Alex G. Fallis
DOI:10.1021/jo00098a007
日期:1994.9
The synthesis of the E- and Z-substituted 1,3-butadienes 5 and 12 and their halodesilylation products 13-16, via Pd(0) mediated coupling of functionalized alkenes of defined stereochemistry, is described.
Boron- and Silicon-Substituted [3]-1-Heterodendralenes as Versatile Building Blocks for the Rapid Construction of Polycyclic Architectures
B and Si, additional assets: Skeletally diverse polycyclic compounds with up to six stereocenters were assembled with excellent stereoselectivity from simple 2‐vinyl α,β‐unsaturated aldehydes possessing a trimethylsilyl or a boronate group at position 3 (see scheme). The pre‐encoded skeletal information was ensured by the initial choice of the positions of the heteroatoms (O, Si or B).