Synthesis of the Enantiomers of Hexahydrodibenz[<i>d,f</i>]azecines
作者:Richard H. Furneaux、Graeme J. Gainsford、Jennifer M. Mason
DOI:10.1021/jo049157q
日期:2004.10.1
Suzuki coupling procedures were used to make appropriate 2-(3-aminopropyl)- 2'-(2-mesyloxy)ethyl disubstituted biphenyl derivatives 19 and 20 from which the racemic hexahydrodibenz[d,f]azecines 3 and 4 were produced following intramolecular mesyloxy displacement in dilute solution. The enantiomers of the former azecine were prepared by use of an analogue of the biphenyl aminomesylate 19 having a chiral auxiliary bound to the amino group during the closure of the 10-membered ring. Absolute configurations were assigned by X-ray diffraction analysis of compound 28.
Synthesis of the C1–C16 fragment of ionomycin using a neutral (η<sup>3</sup>-allyl)iron complex
作者:John P. Cooksey、Philip J. Kocienski、Ying-fa Li、Stefan Schunk、Thomas N. Snaddon
DOI:10.1039/b606262h
日期:——
Key steps in the synthesis of the C1-C16 polyketide fragment of ionomycin were the nucleophilic addition of an organocuprate to a neutral (eta3-allyl)iron complex and the construction of a beta-diketone moiety by the Rh-catalysed rearrangement of an alpha-diazo-beta-hydroxyketone.