Alkynylzirconation of Alkynes and Application to One-Pot Bisalkynylation of Alkynes
摘要:
Stereocontrolled alkynylzirconation of unactivated alkynes was achieved by the reaction of an alkyne with Cp2ZrEt2 and alkynyl halide in this order. After hydrolysis of the alkynylzirconation product, trisubstituted enyne derivatives were obtained in good yields. Functionalized enynes were also prepared by the reaction of the alkynylzirconation products with a variety of electrophiles. Subsequent addition of the second alkynyl halide to the alkynylzirconation products provided an in situ protocol for bisalkynylation of alkynes into (Z)-enediynes in good yields.
Reductive coupling of aromatic aldehydes and imines by the low valent titanium species generated in the reaction of TiCl4 with Et3N
作者:Mariappan Periasamy、Gadthula Srinivas、Galla V Karunakar、Pandi Bharathi
DOI:10.1016/s0040-4039(99)01609-3
日期:1999.10
Aromatic aldehydes and imines are converted to the corresponding diols and diamines using the lowvalenttitanium species generated by the reaction of TiCl4 with triethylamine.
Enediynes from Aza-Enediynes: <i>C</i>,<i>N</i>-Dialkynyl Imines Undergo Both Aza-Bergman Rearrangement and Conversion to Enediynes and Fumaronitriles
作者:Liping Feng、Aibin Zhang、Sean M. Kerwin
DOI:10.1021/ol0600638
日期:2006.5.1
[reaction; see text] Aza-enediynes (C,N-dialkynylimines) undergo thermalaza-Bergmanrearrangement to beta-alkynyl acrylonitriles through 2,5-didehydropyridine (2,5-ddp) intermediates. Certain aza-enediynes also undergo an alternative process affording enediynes and fumaronitriles. Studies employing a specifically (l3)C-labeled aza-enediyne show that the conversion to enediyne is second order in aza-enediyne
Formation of enediynes by reductive coupling followed by alkyne metathesis
申请人:——
公开号:US20040215028A1
公开(公告)日:2004-10-28
One aspect of the present invention relates to methods of preparing enedialkylidyne complexes, enediynes, and alkyne metathesis catalysts, as well as methods of catalyzing alkyne metathesis reactions. The present invention also relates to methods of activating enedialkylidyne complexes for metathesis. The present invention also relates to enedialkylidyne complexes.
reaction of the 1,3-bis(alkylseleno)allenes mainly afforded enediynes through radical pathway, and the nine-membered cyclicallene provided intramolecular cyclization product via an intramolecular rearrangement. Heating of the cyclic bisallenes gave compounds derived from intramolecular cyclization products together with a small amount of the enediynes. Irradiation of allenes caused rearrangement of the selenenyl
Reactions of Ph(2)C(3) dianion, prepared from 1,3-diphenylpropyne and n-butyllithium, with dimethyl diselenide and benzylselenocyanate yielded 1,3-bis(methylseleno)-1,3-diphenylpropadiene and 1,3-bis(benzylseleno)-1,3-diphenylpropadiene, respectively, and the reaction with a mixture of dimethyl diselenide and benzylselenocyanate gave 1-benzylseleno-3-methylseleno-1,3-diphenylpropadiene together with