Solvent- and catalyst-dependent palladium-catalyzed switchable chemodivergent cascade cyclizations of trimethylenemethanes with ortho-formyl cinnamates
Literature Information
Shuyuan Liang, Liangjian Tang, Ying Chen, Xueqiu Huang, Xueqin Wei
Chemodivergent synthetic methodologies enable the efficient generation of structural diversity via simple transformations. Here we develop the palladium-catalyzed chemodivergent cascade cyclization of trimethylenemethane (TMM) with dielectrophilic ortho-formyl cinnamates by effectively regulating solvents and H-bond donor (HBD) co-catalysts. Hexahydrocyclopenta[a]inden-8-ols are obtained through a CC-selective [3 + 2] cycloaddition/aldol process catalyzed by Pd(PPh3)4 in DME, whereas aryl-substituted cyclopentenes are exclusively afforded by tuning the substituents of dielectrophiles. Furthermore, a CO-selective [3 + 2]/Michael process affords tetrahydro-2H-indeno[1,2-b]furan architectures enabled by palladium/urea cooperative catalysis.
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