doi: 10.1021/ol100493v.
Combined directed ortho metalation-halogen dance (HD) synthetic strategies. HD-anionic ortho fries rearrangement and double HD sequences
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- PMID: 20397661
- DOI: 10.1021/ol100493v
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Combined directed ortho metalation-halogen dance (HD) synthetic strategies. HD-anionic ortho fries rearrangement and double HD sequences
Org Lett.
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Abstract
A general and efficient directed ortho metalation (DoM)-halogen dance (HD)-electrophile quench sequence for the synthesis of trisubstituted pyridyl O-carbamates is described. A second HD sequence furnishes highly functionalized tetrasubstituted pyridines. Furthermore, a hitherto unobserved double HD rearrangement is reported. Under similar LDA conditions, aromatic O-carbamates with OMe, Cl, and F substituents (4a-c) undergo either a HD-electrophile quench sequence, 4a-c --> 18-20, or a HD-anionic ortho Fries rearrangement, 4a-c --> 6a-c, respectively.
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