. 2004 Apr 5;101(15):5482–5487. doi: 10.1073/pnas.0308177101

Table 2.

Enantioselective pyrroloindoline formation with representative N(1)- and N(10)-substituted tryptamines

Entry	R¹	R²	Time, h	Yield, %	ee,^* %
1	Allyl	t-Bu	25	85	89
2	Allyl	Et	26	89	89
3	Prenyl	Et	24	89	89
4	Benzyl	Allyl	48	83	89
5	Benzyl	t-Bu	30	82	90^†

Product ratios determined by HPLC.

^†

Absolute configuration determined by chemical correlation.