A new, effective approach for the CC bond formation utilizing 1-,2- and 3-phosphonyl substituted radicals derived from iodoalkylphosphonates and n-Bu3SnH/Et3B/O2 system
作者:Piotr Balczewski、Witold M Pietrzykowski
DOI:10.1016/s0040-4020(97)00405-5
日期:1997.5
A new, practical synthesis of highly substituted phosphonatesutilizing 1-, 2- and 3-phosphonyl substituted radicals derived from iodoalkylphosphonates and a catalytic or stoichiometric amounts of the n-Bu3SnH/Et3B/O2 reagent system is described.
描述了利用衍生自碘代烷基膦酸酯的1-,2-和3-膦酰基取代的基团和催化或化学计量的n- Bu 3 SnH / Et 3 B / O 2试剂体系的新型,实用的高取代膦酸酯的合成方法。
Conversion directe par les alkyllithiens des phosphates en phosphonates α -lithies
作者:Marie-Paule Teulade、Philippe Savignac
DOI:10.1016/s0040-4039(00)95740-x
日期:1987.1
Synthesis of the lower subunit of rhizoxin
作者:Dale L. Boger、Timothy T. Curran
DOI:10.1021/jo00034a010
日期:1992.4
Full details of a study leading to a synthesis of the optically active C13-C26 lower subunit of rhizoxin including the side-chain chromophore characteristic of the full class of antimitotic agents are described. A key element of the synthesis is the stereoselective introduction of the C18-C19 trisubstituted olefin through use of a Wadsworth-Horner-Emmons condensation of 3 with beta-keto phosphonate 38 bearing resident functionality suitable for the diastereoselective introduction of C15-C17 employing a hydroxyl-directed reduction of the resultant beta-hydroxy ketone.
The ring system of the sesterterpene terpestacin has been obtained from a cyclopentanic precursor prepared from endo-3-bromocamphor and from an acyclic keto phosphonate prepared from 6-methylhept-5-en-2-one. The connection of both compounds has been achieved by a Horner-Wadsworth-Emmons reaction on the one hand and by a McMurry reaction on the other. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.