Table 3.

Synthesis of 2-allyltryptophans 3k–o.^a

Entry	Indole	Tryptophan	Time (h)	Yield (%)b
1	1k	3k	48	61
2	1l	3l	16	86
3	1m	3m	16	70
4	1n	3n	72	NR
5	1o	3o	48	68

^aReaction conditions: 1k–o (0.25 mmol), 2a (0.3 mmol), EtAlCl₂ (0.5 mmol), CH₂Cl₂ (2.5 mL), rt. ^bYields of the isolated products after column chromatography. NR, no reaction.