A stereoselective route to 1-chloro-1-halo-enynes, versatile precursors for the synthesis of chloroenediynes and enetriynes
摘要:
1-Chloro-1-halo-enynes, readily available by metallation of (E)-chloroenynes, undergo sequential coupling with terminal alkynes under Pd-catalysis to produce stereoselectively chloroenediynes and enetriynes in good yields.
letter reports the preparation of quinolines, substituted at the 2- or 3-position by a 4-substituted but-3-en-1-yne group, by the environmentally friendly iron(III)-catalyzed coupling reaction of Grignardreagents with 1-chloro-4-(2-quinolyl)but-1-en-3-yne. The extension and the scope of this non-toxic and chemoselective procedure to various functionalized unsaturated vinyl chlorides are described.
Convenient one-pot synthesis of functionalized unsymmetrical (Z) or (E)-enediynes from (Z) or (E)-1,2-dichloroethylene. An efficient route to (Z,Z,Z) and (Z,E,Z)-trienes
作者:Mouâd Alami、Benoit Crousse、Gérard Linstrumelle
DOI:10.1016/s0040-4039(00)73232-1
日期:1994.5
A variety of functionalized unsymmetrical (Z) or (E)-enediynes 1 and 2 are stereospecifically prepared in good overall yield by a simple straightforward one-pot procedure from (Z) or (E)-1,2-dichloroethylene and 1-alkynes. Zinc reduction of 1 and 2 leads efficiently to pure (Z,Z,Z) and (Z,E,Z) conjugated trienes.
An efficient synthesis of 1,3(E),5(Z), 1,3(E),5(E) and 1,3(Z),5(Z)-trienes: Application to the synthesis of galbanolenes and (9Z,11E)-9,11,13-tetradecatrien-1-yl acetate
The (Pd-Cu)-catalyzed reactions of trimethylsilyl acetylene with (E) or (Z)-chloroenynes, or 1-chloro-(1E,3E)-dienes, followed by desilylation and zinc-reduction of the triple bonds led respectively to (3E,5Z), (3Z,5Z) and (3E,5E)-trienes. Application to the syntheses of galbanolenes and (9Z,11E)-9,11,13-tetradecatrien-1-ylacetate has been realized.