PPh<sub>3</sub>-KOBu<sup>t</sup>–Mediated Cyclization Reaction of <font>β</font>-Ketoesters with Alkynyl Ketones: Synthesis of Functionalized 2-Pyrones
Abstract Cyclization of alkynyl ketones with β-ketoesters mediated by PPh3 and KOBut to synthesize 2-pyrone derivatives was systematically described. A variety of β-ketoesters reacted with alkynyl ketones to give functionalized 2-pyrones in moderate to good yields under mild conditions.
Cycloaddition of Alkynyl Ketones with <i>N</i>-Tosylimines Catalyzed by Bu<sub>3</sub>P and DMAP: Synthesis of Highly Functionalized Pyrrolidines and Azetidines
Cycloadditions of alkynyl ketones with N-tosylimines catalyzed by Lewis bases to synthesize azetidines and pyrrolidines were systematically described. In the reaction of alkynyl ketones with N-tosylimines catalyzed by Bu3P at room temperature in toluene, highly functionalized pyrrolidines were formed in good to excellent yields. When DMAP was used in place of Bu3P as catalyst to facilitate the cycloaddition, completely substituted azetidines were produced in moderate to good yields in CH2Cl2. Both cyclization reactions proceeded smoothly with complete stereoselectivity. The scope and limitations of these cycloadditon reactions were also investigated.
SHENG HUAIYU; LIN SHOUYUAN; HUANG YAOZENG, TETRAHEDRON LETT., 27,(1986) N 40, 4893-4894
作者:SHENG HUAIYU、 LIN SHOUYUAN、 HUANG YAOZENG
DOI:——
日期:——
Pd-Catalyzed Carbonylative Reactions of Aryl Iodides and Alkynyl Carboxylic Acids via Decarboxylative Couplings
作者:Ahbyeol Park、Kyungho Park、Yong Kim、Sunwoo Lee
DOI:10.1021/ol102993y
日期:2011.3.4
carboxylic acids reacted with aryliodides under a CO atmosphere in the presence of a palladium catalyst to produce α,β-alkynyl aryl ketones in good yields. The maximum turnover number was 16 800. The desired carbonylativecoupling was formed from phenyl propiolic acid without any formation of a noncarbonylative coupling product in the absence of CuI. However, the reaction with alkyl-substituted alkynyl