... The Journal of Organic ... The organic phase was separated, washed with 1 M HCl and brine, and dried over Na 2 SO 4 . After removal of solvent in vacuo, the ... Ethyl 1-indolizinecarboxylate (6a): 22 a pale yellow oil; 1 H NMR δ 1.41 (t, J = 7.1 Hz, 3H), 4.37 (q, J = 7.1 Hz, 2H), 6.68 (t ...