The synthesis of the δ-lactone portion of the mevinic acids; a new non-acidic method of cyclic lactone expansion
作者:Alan H. Davidson、Chris D. Floyd、Christopher N. Lewis、Peter L. Myers
DOI:10.1039/c39880001417
日期:——
An alkoxy-mercuration demercuration sequence has been used as the key step in an enantiospecific synthesis of a protected synthon for the lactone porton of the mevinicacids.
Reaction of methyl- and phenylthiomethylidene phosphoranes 1 and 2 with a variety of reducing sugars has been explored. Furano-type carbohydrates afforded with good yields the corresponding open-chain vinyl sulfides, whereas pyrano derivatives produced elimination compounds together with the expected vinyl sulfides, depending on the nature of the protective groups.
The intramolecular cation radical diels-alder reaction
作者:Bijan Harirchian、Nathan L Bauld
DOI:10.1016/s0040-4039(00)95876-3
日期:1987.1
The first examples of intramolecularcationradical Diels-Alder reactions have been established using trienes which cyclize to hydroindane systems. The extremely high stereoselectivity characteristic of the cationradical Diels-Alder reaction is effectively exploited to generate -hydroindanes with high selectivity.