Efficient Synthesis of Spirooxindole Pyrrolones by a Rhodium(III)‐Catalyzed C−H Activation/Carbene Insertion/Lossen Rearrangement Sequence
作者:Biao Ma、Peng Wu、Xing Wang、Zhengyu Wang、Hai‐Xia Lin、Hui‐Xiong Dai
DOI:10.1002/anie.201906589
日期:2019.9.16
A rhodium(III)-catalyzed domino annulation of simple olefins with diazo oxindoles to give spirooxindole pyrrolone products is described. This reaction can be formally viewed as the result of an anomalous tandem C-H activation, carbene insertion, Lossen rearrangement, and a nucleophilic addition process. The potential utility of this reaction was further demonstrated by the late-stage diversification
A Rhodium(II)‐Catalyzed Formal [4+1]‐Cycloaddition toward Spirooxindole Pyrrolone Construction Employing Vinyl Isocyanates as 1,4‐Dipoles
作者:Jennifer L. Meloche、Brandon L. Ashfeld
DOI:10.1002/anie.201701147
日期:2017.6
A RhII-catalyzed, formal [4+1]-cycloaddition between diazooxindoles as electrophilic C1 synthons and 1,3-heterodienes for the construction of spirooxindolepyrrolones is described. Employingvinylisocyanates as 1,4-dipoles, the cycloannulation occurs under relatively mild conditions and provides the corresponding pyrrolones in good to excellent yields.
The present invention is related to the use of spiro derivatives of Formula (I) for the treatment and/or prevention of allergic diseases, inflammatory dermatoses and other diseases with an inflammatory component. Specifically, the present invention is related to the use of spiro derivatives for the modulation of CRTH2 activity.