developed for the synthesis of substituted pyrrole derivatives from propargylic acetates, enoxysilanes and primary amines. Various aromatic and aliphatic propargylic acetates participate well in the reaction, providing the propargylation/amination/cycloisomerization products in good yields with complete regioselectivity. The one-pot multicomponent coupling reaction furnishes substituted pyrroles in high
Copper(II) Triflate-Catalyzed Nucleophilic Substitution of Propargylic Acetates with Enoxysilanes. A Straightforward Synthetic Route to Polysubstituted Furans
作者:Zhuang-ping Zhan、Shao-pei Wang、Xu-bin Cai、Hui-juan Liu、Jing-liang Yu、Yuan-yuan Cui
DOI:10.1002/adsc.200700234
日期:2007.9.3
A novel and efficient procedure for the synthesis of γ-alkynyl ketones by the nucleophilic substitution of propargylic acetates with enoxysilanes in the presence of a catalytic amount of Copper(II) triflate, has been developed. The substitution reaction can be followed by a 4-toluenesulfonic acid-catalyzed cyclization without purification of the γ-alkynyl ketone intermediates, offering a straightforward
New synthetic routes to conjugated diallenes from bromoallenes and prop-2-ynyl acetates. Novel C–C coupling with copper(<scp>I</scp>) chloride
作者:Fumio Toda、Yoshikazu Takehira
DOI:10.1039/c39750000174
日期:——
The reactions of the bromoallenes (1) and the prop-2-ynylacetates (3) with CuCl in dimethylformamide (DMF) at room temperature both afford the conjugateddiallenes (2) in good yield.
Ir-Catalyzed Substitution of Propargylic-type Esters with Enoxysilanes
作者:Isamu Matsuda、Ken-ichi Komori、Kenji Itoh
DOI:10.1021/ja0264089
日期:2002.8.1
Propargylic-type acetates react readily with enoxysilanes in the presence of 1 mol % of [Ir(cod)P(OPh)3}2]OTf activated preliminarily with molecular H2 to give beta-alkynyl ketones in high to excellent yields. Substitution at the propargyl carbon proceeds exclusively or selectively in most types of propargylic esters. Alternatively, the formation of the allenyl products is predominant in the reaction of esters, which have two phenyl groups on the propargyl carbon.
FeCl<sub>3</sub>-Catalyzed Nucleophilic Substitution of Propargylic Acetates with Enoxysilanes
作者:Zhuang-ping Zhan、Xu-bin Cai、Shao-pei Wang、Jing-liang Yu、Hui-juan Liu、Yuan-yuan Cui
DOI:10.1021/jo701782g
日期:2007.12.1
[Graphics]An efficient FeCl3-catalyzed substitution reaction of propargylic acetates with enoxysilanes under mild conditions to afford corresponding gamma-alkynyl ketones has been developed. The substitution reaction is followed by a TsOH-catalyzed cyclization without purification of the gamma-alkynyl ketone intermediates, offering a straightforward synthetic route to tri- or tetrasubstituted furans.