Acylselenenyl halides 2(X = Cl, Br) have been generated from RC(O)SeAsPh21 and N-halogenosuccinimide, and the chlorides 2(X = Cl) have been treated with enol silyl ethers to give Se-β-oxoalkyl Selenoesters 5 in good yields.
A novel palladium-catalyzed preparative method of α,β-unsaturated ketones and aldehydes from saturated ketones and aldehydes via their silyl enol ethers
作者:Jiro Tsuji、Ichiro Minami、Isao Shimizu
DOI:10.1016/s0040-4039(00)94160-1
日期:1983.1
Silyl enol ethers prepared from saturated ketones and aldehydes can be converted to α,β-unsaturated ketones and aldehydes by the reaction of allyl carbonate in the presence of palladium-phosphine complexes as a catalyst. The selection of solvent is crucial and nitriles are most effective as the solvent.
We have developed an efficient method for the preparation of enol silyl ethers using novel agents, silazanes together with NaH or DBU catalyst, wherein TMS and TBDMS groups were smoothly and chemoselectively introduced into ketones and aldehydes under mild conditions.
Synthesis of 5-alkylidene-2,5-dihydropyrrol-2-ones and their ring-transformation into 5,6-dihydrobenzo[h]chromones, 5,6,7,8-tetrahydrochromones and pyran-4-ones
作者:Van T.H. Nguyen、Joachim T. Anders、Qingjun Ma、Regine Herbst-Irmer、Peter Langer
DOI:10.1016/j.tet.2007.10.035
日期:2007.12
Acid-mediated ring-transformations of 5-alkylidene-2,5-dihydropyrrol-2-ones, available by cyclization of 1,3-diketone dianions with bis(imidoyl) dichlorides of oxalic acid, resulted in formation of functionalized pyran-4-ones, such as 5,6-dihydrobenzo[h]chromones and 5,6,7,8-tetrahydrochromones.
5-亚烷基-2,5-二氢吡咯-2-酮的酸介导的环转化,可通过将草酸的双(亚氨基酰基)二氯化物与1,3-二酮二价阴离子环化而得到,从而形成官能化的吡喃-4-诸如5,6-二氢苯并[ h ]色酮和5,6,7,8-四氢色酮。
Regiocontrolled Synthesis of Carbocycle-Fused Indoles via Arylation of Silyl Enol Ethers with <i>o</i>-Nitrophenylphenyliodonium Fluoride
作者:Tetsuo Iwama、Vladimir B. Birman、Sergey A. Kozmin、Viresh H. Rawal
DOI:10.1021/ol990759j
日期:1999.8.1
[formula: see text] A new, regiocontrolledsynthesis of carbocycle-fused indoles has been developed. The two-step procedure involves first the regiospecific arylation of silyl enol ethers with o-nitrophenylphenyliodonium fluoride (1). Reduction of the nitro group on the aromatic ring with TiCl3 followed by spontaneous condensation of the aniline with the ketone then affords the indole products.