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Indole dearomatization of tryptophan represents a key approach in the synthesis of indole containing alkaloids. Although the reactivity of C-3a-bromo-, 3a-iodo-, and 3a-chloropyrroloindolines has been explored, the utility and reactivity… Click to show full abstract
Indole dearomatization of tryptophan represents a key approach in the synthesis of indole containing alkaloids. Although the reactivity of C-3a-bromo-, 3a-iodo-, and 3a-chloropyrroloindolines has been explored, the utility and reactivity of C-3a-fluoropyrroloindolines has remained untapped. Here we induce the C-F bond to undergo a Sn1-like reaction. We demonstrate the utility of 3a-fluoropyrroloindoline to access C-2-thiol-substituted tryptophans and C-3a-substituted pyrroloindolines under mild conditions in high yield. A range of Nα-protecting groups and free -COOH are well-tolerated.
Journal Title: Organic letters
Year Published: 2019
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