Synthesis of 4a-carba-β-l-lyxofuranose, 4a-carba-β-l-arabinofuranose and 2,2,5-trimethyl-3a,6a-dihydro-cyclopenta[1,3]dioxol-4-one using Mn/CrCl3 mediated domino reactions and ring closing metathesis
摘要:
A common method for the synthesis of 4a-carba-beta-L-lyxofuranose and 4a-carba-beta-L-arabinofuranose from D-mannose and 2,2,5-trimethy1-3a,6a-dihydro-cyclopenta[1,3]dioxol-4-one from o-ribose is described using catalytic Nozaki-Hiyama-Kishi (NHK) conditions and ring closing metathesis (RCM). In this transformation, omega-deoxy-omega-iodo manno/ribo furanoside undergoes reductive elimination in the presence of Mn/CrCl3 to give the corresponding olefin-aldehyde which was trapped by nucleophile under the same conditions to afford the desired diolefinic species. The ring closing metathesis reaction on these diolefinic species with Grubbs second generation catalyst produced the required carbocycles. (c) 2012 Elsevier Ltd. All rights reserved.
Synthesis of (+)-Lycoricidine by the Application of Oxidative and Regioselective Ring-Opening of Aziridines
作者:J. S. Yadav、G. Satheesh、Changalvala V. S. R. Murthy
DOI:10.1021/ol100755v
日期:2010.6.4
A highly stereoselective total synthesis of (+)-lycoricidine has been described. The salient features of this synthesis are the one-pot elimination followed by allylation reaction, ring-closing metathesis, stereoselective aziridine formation, Dess−Martin periodinane, and silica gel mediated oxidativering-opening of aziridine to form α,β-unsaturated ketone (allyl amine) and intramolecular Heck cyclization
A stereoselective route towards highly functionalized 4,6-diaminocyclohexene derivatives
作者:Steven H.L. Verhelst、Wouter Wiedenhof、Huib Ovaa、Gijsbert A. van der Marel、Herman S. Overkleeft、Constant A.A. van Boeckel、Jacques H. van Boom
DOI:10.1016/s0040-4039(02)01364-3
日期:2002.9
A flexible synthetic route towards chirally pure 4,6-diaminocyclohexene derivatives based on palladium catalyzed allylic amination of carbohydrate derived cyclohexenes is presented.
Metal-graphite reagents in carbohydrate chemistry. 8. The scope and limitations of the use of zinc/silver-graphite in the synthesis of carbohydrate-derived substituted hex-5-enals and pent-4-enals