Nucleophilic addition of regioselectively lithiated indoline with aldimines for the syntheses of 2- and 7-indolinyl methanamine derivatives
摘要:
Indolines bearing different N-protecting groups (N-Tbf and N-Boc) were deprotonated regioselectively at C-2 (sp(3) hybridized ortho-H) and C-7 (sp(2) hybridized para-H) of the indoline ring, respectively. The generated organolithium intermediates reacted with aldimines to give the desired products in good yields with excellent anti-diastereoselectivities (>99:1). The produced N-Ts-(1-Tbf-indolin-2-yl)methanamine was facilely transformed to a fused heterocyclic compound. (C) 2012 Elsevier Ltd. All rights reserved.
Dipole stabilized a-amino carbanions. III. Metalation-alkylation of indolines, tetrahydroquinolines and n-methylanilines.
作者:A.I. Meyers、Stuart Hellring
DOI:10.1016/s0040-4039(01)92435-9
日期:1981.1
Metalation of the 2-position in indolines and tetrahydroquinolines is feasible via their fomamidine derivatives using -butyllithium. The N-methyl group in N-methylanilines is also metalated using this base.
Indolines bearing different N-protecting groups (N-Tbf and N-Boc) were deprotonated regioselectively at C-2 (sp(3) hybridized ortho-H) and C-7 (sp(2) hybridized para-H) of the indoline ring, respectively. The generated organolithium intermediates reacted with aldimines to give the desired products in good yields with excellent anti-diastereoselectivities (>99:1). The produced N-Ts-(1-Tbf-indolin-2-yl)methanamine was facilely transformed to a fused heterocyclic compound. (C) 2012 Elsevier Ltd. All rights reserved.