Rhenium-Promoted C−C Bond-Cleavage Reactions of Internal Propargyl Alcohols
作者:Kui Fun Lee、Wei Bai、Herman H. Y. Sung、Ian D. Williams、Zhenyang Lin、Guochen Jia
DOI:10.1002/chem.201801448
日期:2018.7.11
first examples of C−C bond cleavage reactions of internal propargylalcohols to give vinylidene complexes are described. Treatment of [Re(dppm)3]I with RC≡CC(OH)R′R′′ (R=aryl, alkyl; C(OH)R′R′′=C(OH)Ph2, C(OH)Me2, C(OH)HPh, C(OH)H2) produced the vinylidene complexes ReI(=C=CHR)(dppm)2 with the elimination of C(O)R′R′′. Computational studies support that the reactions proceed through a β‐alkynyl elimination
描述了内部炔丙醇的CC键裂解反应以得到亚乙烯基配合物的第一个例子。用RC≡CC(OH)R'R''(R =芳基,烷基; C(OH)R'R''= C(OH)Ph 2, C(OH)处理[Re(dppm)3 ] I Me 2,C(OH)HPh,C(OH)H 2)消除了C(O)R'R''生成亚乙烯基配合物ReI(= C = CHR)(dppm)2。计算研究支持该反应通过醇盐中间体Re OC(R')(R'')C≡CR}(dppm)2的β-炔基消除进行。
Transformatiom of Propargylic Alcohols into Enones
α,α-Disubstituted propargylic alcohols were transformed into enones by the catalysis with Ag(I) or Ag(I)–Me3SiCl under the mild conditions. This procedure provides a new synthetic method of α,β-unsaturated ketones having an oxygen function at α′ position from 2-butyne-1,4-diol derivatives. 3-Acetoxy-1,4,4-triphenyl-3-buten-2-one was obtained from 4-acetoxy-1,1,4-triphenyl-2-butyn-1-ol by the catalysis with tin(IV) chloride or aluminium chloride.
Access to Polysubstituted Halophosphorylated Dihydrofurans via Halotrimethylsilane-Promoted Cascade Cyclization of γ-Hydroxyl Ynones with Diphenylphosphine Oxides
of practical polysubstituted halophosphorylated dihydrofuran derivatives. It is noteworthy that halotrimethylsilane functions as a halogenation reagent as well as a promoter to initiate this transformation. In addition, the reaction system can also be scaled up to gram quantities, and the produced halogenated compounds can undergo further derivatizations by Pd-catalyzed coupling reactions.
Synthesis of 3(2<i>H</i>)-furanone derivatives: <i>p</i>-TsOH/halotrimethylsilane promoted cycloketonization of <i>γ</i>-hydroxyl ynones
作者:Yi-Feng Qiu、Jian-He Cao、Shutao Wang、Qiang Wang、Ming Li、Jun-Jiao Wang、Zheng-Jun Quan、Xi-Cun Wang
DOI:10.1039/d3ob01500a
日期:——
A p-TsOH/halotrimethylsilane facilitated cycloketonization of γ-hydroxyl ynones is detailed. This methodology enables the one-step synthesis of polysubstituted 3(2H)-furanone products. It is remarkable that the reaction exhibits excellent regio- and chemoselectivity by the addition of very small quantities of p-toluenesulfonic acid and water.
详细描述了对-TsOH /卤代三甲基硅烷促进γ-羟基炔酮的环酮化。该方法能够一步合成多取代的 3(2 H )-呋喃酮产品。值得注意的是,通过添加极少量的对甲苯磺酸和水,该反应表现出优异的区域选择性和化学选择性。
Chodkiewicz, Annales de Chimie (Cachan, France), 1957, vol. <13> 2, p. 819,861, 862