(+)-(S)-α-diethoxyphosphorylvinyl p-tolyl sulfoxide: A new chiral Michael acceptor and dienophile
作者:Marian Mikołajczyk、Wanda H. Midura
DOI:10.1016/s0957-4166(00)86048-6
日期:1992.12
reagent, (+)-(S)-1, was prepared from (+)-(S)s-α-diethoxy-phosphorylethyl p-tolyl sulfoxide 2 by phenylselenylation-deselenylation procedure. Its reactivity was demonstrated by diastereoselective Michael addition of ethanethiol giving rise to 3, tandem Michael addition/intramolecular Horner--Wittig reaction with 2-formyl pyrrole leading to the corresponding pyrrolizine sulfoxide 5 and cycloaddition with cyclopentadiene
The nucleophilic substitution reaction of carbohydrate imidazole-1-sulfonates with pyrrole and other nitrogen heterocyclic compounds is reported for the first time. Several novel N-carbohydrate-derived heterocyclic compounds have been prepared by this displacement reaction. The desired carbon-nitrogen bond formation proceeds under mild conditions to generate the coupling products in good yields with readily available and inexpensive reagents. This method is particularly suitable for carbohydrate imidazole-1-sulfonates of primary alcohols. Supplemental materials are available for this article. Go to the publisher's online edition of Journal of Carbohydrate Chemistry to view the free supplemental file.
Activation and coupling of pyrrole-1-carboxylic acid in the formation of pyrrole N-carbonyl compounds: pyrrole-1-carboxylic acid anhydride
作者:Dale L. Boger、Mona Patel
DOI:10.1021/jo00387a046
日期:1987.5
Mikolajczyk Marian, Midura Wanda H., Tetrahedron, 3 (1992) N 12, S 1515-1518