Ambient Synthesis of Dienals via Triazole–Gold and Amine Catalysis Relay
作者:Stephen E. Motika、Qiaoyi Wang、Xiaohan Ye、Xiaodong Shi
DOI:10.1021/ol503393a
日期:2015.1.16
A highly efficient synthesis of substituted conjugated dienals was developed through a triazole–gold (TA–Au)-catalyzed propargyl vinyl etherrearrangement followed by an amine catalyzed allene–aldehyde tautomerization. Various substituted vinylogous aldehydes were prepared in one pot with good to excellent yields (up to 95%) under mild conditions with high atom economy.
Stereocontrolled Synthesis of (<i>E,Z</i>)-Dienals <i>via</i> Tandem Rh(I)-Catalyzed Rearrangement of Propargyl Vinyl Ethers
作者:Dinesh V. Vidhani、Marie E. Krafft、Igor V. Alabugin
DOI:10.1021/ol4019985
日期:2013.9.6
A novel Rh(I)-catalyzed approach to functionalized (E,Z) dienals has been developed viatandem transformation where a stereoselective hydrogen transfer follows a propargyl Claisen rearrangement. Z-Stereochemistry of the first double bond suggests the involvement of a six-membered cyclic intermediate whereas the E-stereochemistry of the second double bond stems from the subsequent protodemetalation
STERO CONTROLLED SYNTHESIS OF (E,Z)-DIENALS VIA TANDEM RH(I) CATALYZED PROPARGYL CLAISEN REARRANGEMENT
申请人:The Florida State University Research Foundation, Inc.
公开号:US20150361019A1
公开(公告)日:2015-12-17
A novel Rh(I)-catalyzed approach to synthesizing functionalized (E,Z) dienal compounds has been developed via tandem transformation where a stereoselective hydrogen transfer follows a propargyl Claisen rearrangement. Z-Stereochemistry of the first double bond suggests the involvement of a six-membered cyclic intermediate whereas the E-stereochemistry of the second double bond stems from the subsequent protodemetallation step giving an (E,Z)-dienal. The reaction may be represented by the following sequence.
alcohols are prepared from propargyl vinyl ethers using a trinuclear gold(I)-oxo complex, [(Ph3PAu)3O]BF4, as a catalyst for propargyl Claisen rearrangement at room temperature. The gold(I)-catalyzed reaction is effective for a diverse collection of propargyl vinyl ethers, including substrates containing aryl and alkyl groups at the propargylic position, and hydrogen, aryl, and alkyl substituents at the alkyne
Synthesis of Allenes through Triazole Gold(III) Catalysed Rearrangement of Propargyl Vinyl Ethers
作者:Dawei Wang、Yongchun Yang、Ronghui Huang、Likui Wang、Huida Wan
DOI:10.3184/174751916x14754985053189
日期:2016.11
of allene derivatives was developed through pyridyltriazole gold(III) catalysed rearrangement of propargyl vinyl ethers with moderate to good yields. It was found that the pyridyltriazole gold(III) complex is a good chemoselective catalyst in selective activation of alkynes and allenes. Compared to gold(I) catalysts, the pyridyltriazole gold(III) shows much better substrate tolerance and much higher