Demonstration of 14–20-membered intramolecular carbonyl ylides: diastereoselective synthesis of macrocycles incorporating spiro-indolooxiranes
摘要:
A range of macrocycles (13-19-membered) possessing spiro-indolooxirane unit were synthesized with complete diastereoselectivity in good yield by the rhodium(II) acetate catalyzed reaction of substituted cyclic diazoamides in dry dichloromethane. The reaction proceeds via the formation of the corresponding macrocyclic carbonyl ylide followed by a con-rotatory electrocyclization process. (C) 2011 Elsevier Ltd. All rights reserved.
Rhodium(<scp>ii</scp>) catalyzed synthesis of macrocycles incorporating oxindole via O–H/N–H insertion reactions
作者:Sengodagounder Muthusamy、Thangaraju Karikalan
DOI:10.1039/c4ob01671h
日期:——
an oxindole unit were synthesized in good yield via rhodium(II) acetate dimer catalyzed intramolecular O–H/N–H insertion reactions. Interestingly, synthesis of C2-symmetric macrocycles in moderate yield was also demonstrated via head to tail dimerization involving double intermolecular O–H insertion when the spacer length was decreased. The synthesis of chiral macrocycles was also delineated. This study