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. Author manuscript; available in PMC: 2020 Nov 1.
Published in final edited form as: Org Lett. 2019 Oct 17;21(21):8695–8699. doi: 10.1021/acs.orglett.9b03298

Figure 1.

Figure 1.

(A) Butenolides (blue) are common motifs in bioactive natural products. Recent work by (B) Lin and (C) Sun featured intermolecular reactions between CpOs and carbonyls to generate functionalized butenolides.