Merging Rh(III)-Catalyzed C-H Activation and Strain Release of Bicyclo[1.1.0]butanes: Modular Access to Conjugated
Zi-Xuan Wan1, Ming-Jie Ou1, Jun-Jie Jiang1
1Center for Drug Research and Development, Guangdong Pharmaceutical University, Guangzhou510006, P. R. China.
Abstract:
We report a Rh(III)-catalyzed C-H activation and strain-release cascade that merges inert C-H bond functionalization with the ring opening of bicyclo[1.1.0]butanes (BCBs) to directly access conjugated dienes. The reaction leverages the unique alkene-like reactivity of the BCB bridgehead bond and the versatility of Rh(III) catalysis to enable simultaneous C-H cleavage and C-C scission, offering a new disconnection for diene synthesis in up to 95% yield. The resulting conjugated diene scaffolds demonstrate versatile synthetic utility, including D-A cycloaddition, [3+2] cyclization, and thia-Michael addition reactions. Importantly, this work represents the first use of BCBs as diene precursors, expanding their reaction manifold and providing a new avenue for the development of novel transformations.
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