Trifluoroacetic acid → HCID 21489497, compound

Participants

Reaction Conditions

Reaction Steps

A solution containing 8 (2.9 g, 7.1 mmol) in EtOAc (ca. 5 mL) was cooled in an ice-bath and pre-cooled TFA (20.3 mL) was added in one portion. The resulting yellow-colored solution was stirred at 2-4° C. After 4.75 h, the cold reaction mixture was transferred (via canula) with stirring into a pre-cooled mixture of EtOAc (30 mL), and 25% aq. K2CO3 (80.7 g). The aqueous layer was separated and extracted with EtOAc (3×30 mL) and the combined organic extracts were washed with 10% aq. Na2CO3 (30 g). The organic solution was concentrated in vacuo and azeotropically dried using anhydrous EtOAc to afford 2.95 g of indolylindoline diastereomers as a yellow-colored foam which was used directly in the next reaction. Mass spectrum (ESI), m/z 821.3 [(M)+; calcd for C46H46F2N4O8: 820.9].

Provenance & Evidence