2-烯基苯酚和烯酰胺的催化对映选择性卤环化已经通过使用手性酰胺磷酸盐催化剂和卤代路易斯酸实现。密度泛函理论计算表明催化剂的路易斯碱度在反应性和对映选择性中起重要作用。所得手性卤代色满可以在短时间内转化为 α-生育酚、α-生育三烯酚、代达林 A 和英格列酮。此外,具有不饱和侧链的卤化产物可在自由基环化条件下提供多环加合物。
NOVEL CHIRAL DIHYDROBENZOAZAPHOSPHOLE LIGANDS AND SYNTHESIS THEREOF
申请人:Boehringer Ingelheim International GmbH
公开号:US20180155377A1
公开(公告)日:2018-06-07
This invention relates to novel phosphorous ligands useful for organic transformations. Methods of making and using the ligands in organic synthesis are described. The invention also relates to processes for preparing the novel ligands.
Intramolecular Oxycyanation of Alkenes by Cooperative Pd/BPh<sub>3</sub> Catalysis
作者:Dennis C. Koester、Masato Kobayashi、Daniel B. Werz、Yoshiaki Nakao
DOI:10.1021/ja301375c
日期:2012.4.18
intramolecular oxycyanation of alkenes through the cleavage of O-CN bonds and the subsequent insertion of double bonds. The use of 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Xantphos) as a ligand for palladium is essential for allowing the transformation to proceed with high chemo- and regioselectivity. Variously substituted dihydrobenzofurans with both a tetra-substituted carbon and cyano functionality
Insertion of an Alkene into an Ester: Intramolecular Oxyacylation Reaction of Alkenes through Acyl CO Bond Activation
作者:Giang T. Hoang、Venkata Jaganmohan Reddy、Huy H. K. Nguyen、Christopher J. Douglas
DOI:10.1002/anie.201005767
日期:2011.2.18
Atom economy and esters: compatible now! The first catalytic insertion of a CC bond into an acyl CO bond was achieved using rhodium catalysts (see scheme). The products are β‐alkoxy ketones with a fully substituted carbon center. Quinoline chelating groups were employed to stabilize the Rh‐alkoxide intermediate.
Development and Mechanistic Study of Quinoline-Directed Acyl C–O Bond Activation and Alkene Oxyacylation Reactions
作者:Giang T. Hoang、Dylan J. Walsh、Kathryn A. McGarry、Constance B. Anderson、Christopher J. Douglas
DOI:10.1021/acs.joc.6b03011
日期:2017.3.17
acyl substituent across an alkene, oxyacylation of alkenes, using rhodium catalyzed C–O bond activation of an 8-quinolinyl ester is described. Our unsuccessful attempts at intramolecular carboacylation of ketones via C–C bond activation ultimately informed our choice to pursue and develop the intramolecular oxyacylation of alkenes via quinoline-directed C–O bond activation. We provide a full account
chemistry is reported. Both phenol and aromatic or aliphatic acid derivatives could be used under operator-friendly conditions (room temperature, technical solvents, under air). The discovery of the superiority of benziodoxolone-derived hypervalent iodine reagent 3d as an alkyne transfer reagent further expands the rapidly increasing utility of hypervalent iodine reagents in catalysis and is expected