Journal of Organic Chemistry p. 447 - 452 (1980)
Update date:2022-08-02
Topics:
Adam, Waldemar
Takayama, Kiyoshige
3-Indolyl-, (N-methyl-3-indolyl)-, and (N-methyl-2-methyl-3-indolyl)acetic acids are quantitatively α-lithiated directly with n-BuLi, while methyl (N-methyl-3-indolyl)acetate is quantitatively α-lithiated with lithium diisopropylamide (LDA) at -78 deg C in THF.These useful synthons react readily with electrophiles such as alkyl halides, chlorosilanes, and ketones to afford the respective α-alkyl derivatives 1, ketene silyl acetals 2, and β-hydroxy acids 3.Photosensitized oxygenation of the ketene silyl acetals 2 affords 1,2-diox-4-ene products through (2 + 4) cycloaddition with singlet oxygen.
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