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.
STEREO 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:US20170129865A1
公开(公告)日:2017-05-11
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.
US9573871B2
申请人:——
公开号:US9573871B2
公开(公告)日:2017-02-21
US9758499B2
申请人:——
公开号:US9758499B2
公开(公告)日:2017-09-12
Rh(I)-Catalyzed Transformation of Propargyl Vinyl Ethers into (<i>E</i>,<i>Z</i>)-Dienals: Stereoelectronic Role of <i>trans</i> Effect in a Metal-Mediated Pericyclic Process and a Shift from Homogeneous to Heterogeneous Catalysis During a One-Pot Reaction
作者:Dinesh V. Vidhani、Marie E. Krafft、Igor V. Alabugin
DOI:10.1021/jo402505f
日期:2014.1.3
experiments and computations reveals unusual features of stereoselective Rh(I)-catalyzed transformation of propargyl vinylethers into (E,Z)-dienals. The first step, the conversion of propargyl vinylethers into allene aldehydes, proceeds under homogeneous conditions via a “cyclization-mediated” mechanism initiated by Rh(I) coordination at the alkyne. This path agrees well with the small experimental