Catalytic Asymmetric Synthesis of Chiral Allylic Esters
作者:Jeffrey S. Cannon、Stefan F. Kirsch、Larry E. Overman
DOI:10.1021/ja106685w
日期:2010.11.3
A broadly useful catalytic enantioselective synthesis of branched allylicesters from prochiral (Z)-2-alkene-1-ols has been developed. The starting allylicalcohol is converted to its trichloroacetimidate intermediate by reaction with trichloroacetonitrile, either in situ or in a separate step, and this intermediate undergoes clean enantioselective S(N)2' substitution with a variety of carboxylic acids
Synthesis of Pentahydroxylated Pyrrolizidines and Indolizidines
作者:Juan A. Tamayo、Francisco Franco、Daniele Lo Re、Fernando Sánchez-Cantalejo
DOI:10.1021/jo900801c
日期:2009.8.7
been used in the synthesis of pentahydroxylated pyrrolizidines (8 and 10) and indolizidines (9 and 11). The pyrrolizidinic and indolizidinic skeletons were built after internal n-alkylation of the suitably functionalized pyrroloisoxazolidine intermediates obtained by the necessary protecting group manipulations. This method expands the scope of cycloaddition reactions in the synthesis of new and highly
Stereochemical Aspects of 1,3-Butadiene Metabolism and Toxicity in Rat and Mouse Liver Microsomes and Freshly Isolated Rat Hepatocytes
作者:Joe L. Nieusma、David J. Claffey、Chris Maniglier-Poulet、Tomasz Imiolczyk、David Ross、James A. Ruth
DOI:10.1021/tx960199m
日期:1997.4.1
and plastics industry. BD and its epoxide metabolites have been shown to be carcinogenic and mutagenic in rodents, and BD has been classified by IARC as a group 2A carcinogen. We have examined the role of stereochemistry in species-dependent metabolism and toxicity of BD. Diastereo- and enantioselective syntheticroutes to butadiene monoxide (BMO), butadiene bisoxide (BBO), and 3,4-epoxybutane-1,2-diol
作者:Peter J. Meloncelli、Alan D. Martin、Todd L. Lowary
DOI:10.1016/j.carres.2009.02.032
日期:2009.6
The use of glycosyl iodides as an effective method for the preparation of glycosides has had a recent resurgence in carbohydrate chemistry, despite its early roots in which these species were believed to be of limited use. Renewed interest in these species as glycosylating agents has been spurred by their demonstrated utility in the stereoselective preparation of O-glycosides, and other glycosylic compounds. This review provides a brief historical account followed by an examination of the use of glycosyl iodides in the synthesis of oligosaccharicles and other glycomimetics, including C-glycosylic compounds, glycosyl azides and N-glycosides. (C) 2009 Elsevier Ltd. All rights reserved.
Efficient Synthesis of a C-Analogue of the Immunogenic Bacterial Glycolipid BbGL2
作者:Suvarn S. Kulkarni、Jacquelyn Gervay-Hague
DOI:10.1021/ol062354m
日期:2006.12.1
Synthesis of a C-analogue of bacterial glycolipid BbGL2 is reported using Grignard reaction of in situ generated beta-galactosyl iodide and subsequent olefin cross metathesis reaction of C-vinyl galactoside as key steps.