Regio- and diastereoselective formation of some (η6-2-methylindoline)tricarbonylchromium(0) complex derivatives
摘要:
Complexation of 2-methylindoline 1 and its derivatives 2 and 3 with Cr(CO)(6) gave complexes 4-9. With the TIPS group attached to the nitrogen atom as in compound 3, the complexation was completely diastereoselective producing the endo complex 9. Treatment of the metallated complexes 8 and 9 with 2-halobenzoyl chlorides as electrophiles allowed for totally regioselective functionalisation at C(4), while the exo complex 6 was functionalised both at C(4) and C(7); with TMSCl and TIPSCl as electrophiles, the endo complex 9 also exhibited minor exo benzylic substitution to give 25 and 27. Oxidative decomplexation of the indoline complexes efficiently releases the free 4-substituted indolines. (C) 2001 Elsevier Science B.V. All rights reserved.
Regio- and diastereoselective formation of some (η6-2-methylindoline)tricarbonylchromium(0) complex derivatives
摘要:
Complexation of 2-methylindoline 1 and its derivatives 2 and 3 with Cr(CO)(6) gave complexes 4-9. With the TIPS group attached to the nitrogen atom as in compound 3, the complexation was completely diastereoselective producing the endo complex 9. Treatment of the metallated complexes 8 and 9 with 2-halobenzoyl chlorides as electrophiles allowed for totally regioselective functionalisation at C(4), while the exo complex 6 was functionalised both at C(4) and C(7); with TMSCl and TIPSCl as electrophiles, the endo complex 9 also exhibited minor exo benzylic substitution to give 25 and 27. Oxidative decomplexation of the indoline complexes efficiently releases the free 4-substituted indolines. (C) 2001 Elsevier Science B.V. All rights reserved.
Regio- and diastereoselective formation of some (η6-2-methylindoline)tricarbonylchromium(0) complex derivatives
作者:M.Filomena D Costa、M.Rute G da Costa、M.J Marcelo Curto
DOI:10.1016/s0022-328x(01)00694-5
日期:2001.4
Complexation of 2-methylindoline 1 and its derivatives 2 and 3 with Cr(CO)(6) gave complexes 4-9. With the TIPS group attached to the nitrogen atom as in compound 3, the complexation was completely diastereoselective producing the endo complex 9. Treatment of the metallated complexes 8 and 9 with 2-halobenzoyl chlorides as electrophiles allowed for totally regioselective functionalisation at C(4), while the exo complex 6 was functionalised both at C(4) and C(7); with TMSCl and TIPSCl as electrophiles, the endo complex 9 also exhibited minor exo benzylic substitution to give 25 and 27. Oxidative decomplexation of the indoline complexes efficiently releases the free 4-substituted indolines. (C) 2001 Elsevier Science B.V. All rights reserved.