Liu K, Wang G, Zhang ZW, Shi YY, Ye ZS. C-C Bond Activation of Cyclopropanes Enabled by Phosphine-Catalyzed
In Situ Formation of High-Strain Methylenecycopropane Intermediate.
Org Lett 2022;
24:6489-6493. [PMID:
36069728 DOI:
10.1021/acs.orglett.2c02201]
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Abstract
An effective strategy for the ring-opening/elaboration of cyclopropanes by phosphine catalyst is documented, providing the 2,4-pentadiene sulfonamides and isoindolines in moderate to good yields. The key to the success of this reaction is phosphine-catalyzed introduction of a trigonal center into cyclopropanes, which results in the formation of higher ring strain cyclopropylidenemethyl phosphonium salt. Moreover, this methodology is employed as the key step for the synthesis of bioactive molecules.
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