Synthetic strategies to epoxydiynes and a key synthon of the neocarzinostatin chromophore
作者:Olivier Thominet、James R. Baker、Hugh Britton、Zac C. Etheridge、Marco G. Soscia、Stephen Caddick
DOI:10.1039/b711196g
日期:——
towards the synthesis of epoxydiynes which represent an unusual structural feature of the neocarzinostatinchromophore. A number of different routes to these epoxydiynes have been explored with varying success. Ultimately a concise and convergent approach was developed, which involved the addition of an allenyl zinc bromide to propargylic ketones/aldehydes followed by epoxide formation. This new protocol
Trialkylsilanes readily undergo dehydrocondensation with acetylene and substituted acetylenes in the presence of the catalytic systems, H2PtCl6/iodine, lithium iodide or /trialkyliodosilanes, and so the monosubstitutedacetylenes HCCR (R = C4H9, C(CH3)3, CH2Cl, C6H5) smoothly afford the corresponding trialkyl(organylethynyl)silanes. In hexane or benzene the yield of the dehydrocondensation products
在催化体系,H 2 PtCl 6 /碘,碘化锂或/三烷基碘硅烷的存在下,三烷基硅烷很容易与乙炔和取代的乙炔进行脱氢缩合反应,因此单取代的乙炔HCCR(R = C 4 H 9,C(CH 3)3,CH 2 Cl,C 6 H 5)平稳地得到相应的三烷基(有机基乙炔基)硅烷。在己烷或苯中,脱氢缩合产物的产率为90%。三乙基硅烷与乙炔的脱氢产物为双(三乙基磺酰基)乙炔和1,2-双(三乙基甲硅烷基)乙烷。讨论了反应机理。
An Efficient Synthesis of Epoxydiynes and a Key Fragment of Neocarzinostatin Chromophore
作者:J. R. Baker、O. Thominet、H. Britton、S. Caddick
DOI:10.1021/ol062461g
日期:2007.1.1
A key structural feature of the Neocarzinostatin chromophore is a reactive epoxydiyne. We present here a new method for the preparation of epoxydiynes by the addition of an allenyl zinc bromide to a propargylic ketone.
Shostakovskii,M.F. et al., Journal of general chemistry of the USSR, 1961, vol. 31, p. 2333 - 2336
作者:Shostakovskii,M.F. et al.
DOI:——
日期:——
Reaction of triethylsilane with propargyl chloride in the presence of the H2PtCl6-I2 catalytic system
作者:V. B. Pukhnarevich、N. I. Ushakova、I. I. Tsykhanskaya、A. I. Albanov、M. G. Voronkov