Yao T, She JE, Li T, Qin X. Highly Regio- and Diastereoselective Synthesis of 6,7-Dihydro-4
H-furo[3,4-
c]pyran Derivatives through Pd-Catalyzed Formal (3 + 3) Allylic Cycloaddition of 2-Butene-1,4-diols with 2-(1-Alkynyl)-2-alken-1-ones.
Org Lett 2024;
26:2018-2022. [PMID:
38422043 DOI:
10.1021/acs.orglett.4c00089]
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Abstract
A highly efficient synthesis of 7-vinyl-6,7-dihydro-4H-furo[3,4-c]pyran derivatives from 2-butene-1,4-diols and 2-(1-alkynyl)-2-alken-1-ones has been achieved with high regio- and diastereoselectivity (dr > 20:1) by Pd-catalyzed tandem heterocyclization/cross-coupling. The π-allyl palladium species Int II generated from 2-butene-1,4-diol by direct cleavage of the C-OH bond is the key to the success in this formal (3 + 3) cycloaddition reaction.
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