Stereoselective synthesis of all-trans methyl substituted polyenes by reductive elimination and application to the synthesis of all-trans 3-methyl-nona-2,4,6-trienol
作者:Guy Solladié、Françoise Colobert、Chakib Kalaı̈
DOI:10.1016/s0040-4039(00)00564-5
日期:2000.5
The stereoselectivesynthesis of all-trans 3-methyl-nona-2,4,6-trienol 2 by reductive elimination of the corresponding 1,6-dibenzoate-2-methyl-2(Z),4(Z)-diene is described. This result shows that reductive elimination can be extended to the formation of all-trans methyl substituted polyenes which are present in many natural products biosynthetically made from isoprenic units.
作者:Sergej Lysenko、Jeroen Volbeda、Peter G. Jones、Matthias Tamm
DOI:10.1002/anie.201202101
日期:2012.7.2
The tungsten benzylidyne complex [PhCWOSi(OtBu)3}3] efficiently catalyzes the metathesis of conjugated diynes and ring‐closing diyne metathesis (see scheme). Although this reaction implies CC single‐bond activation, 13C labeling studies reveal that it proceeds by classical alkylidyne group exchange and involves cleavage and formation of carbon–carbon triple bonds.
苄基钨络合物[PhCWOSi(O t Bu)3 } 3 ]有效催化共轭二炔的复分解和闭环二炔的复分解(参见方案)。虽然此反应意味着Ç C单键活化,13 Ç标记研究表明,它前进通过经典次烷基组交换并涉及切割和形成的碳-碳三键。
Stereoselective Total Syntheses of Polyacetylene Plant Metabolites via Ester-Tethered Ring Closing Metathesis
作者:Bernd Schmidt、Stephan Audörsch
DOI:10.1021/acs.joc.6b02987
日期:2017.2.3
Totalsyntheses of five naturally occurring polyacetylenes from three different plants are described. These natural products have in common an E,Z-configured conjugated diene linked to a di- or triyne chain. As the key method to stereoselectively establish the E,Z-diene part, an ester-tethered ring-closing metathesis/base-induced eliminative ring opening sequence was used. The results presented herein
Synthesis of Naturally Occurring Acetylenes via an Alkylidene Carbenoid Rearrangement
作者:Annabelle L. K. Shi Shun、Rik R. Tykwinski
DOI:10.1021/jo034734g
日期:2003.8.1
Naturallyoccurring mosquito larvicidal acetylenes 1 and 2, and analogues 3 and 4, each containing either a 1,3-butadiynyl or a 1,3,5-hexatriynyl moiety, are synthesized via a Fritsch-Buttenberg-Wiechell rearrangement. The alkylidene carbenoid intermediate results from lithium-halogen exchange of a suitable dibromoolefin precursor, and the rearrangement is accomplished under mild conditions. Synthesis
Acylation reactions of silylated butadiynes: synthesis of some naturally occuring diacetylenic ketones
作者:Graham E. Jones、Andrew B. Holmes
DOI:10.1016/s0040-4039(00)88596-2
日期:1982.1
Acylation of 4-substituted 1-trimethylsilylbuta-1,3-diynes (2) with suitable acyl halides in the presence of titanium tetrachloride gave diacetylenicketones (3) including the naturally occurring compounds (3c), (3e), and (3f).