A method for effectively favouring 5-endo- over 5-exo-cyclisations
摘要:
Iodocyclisation of sulfonamido-alcohol 6 proceeds by a 5-exo pathway to give amino-THFs 9 whereas the furyl derivative 10 gives the pyrrolidines 11 and 12, most likely by an alternative 5-exo mechanism, instigated by the furan ring. (C) 1998 Elsevier Science Ltd. All rights reserved.
The synthesis of 5-substituted proline derivatives and of 5-substituted pyrrole-2-carboxylates by 5-endo cyclisations featuring a method for effectively favouring these with respect to 5-exo cyclisations