| 摘要 |
FIELD: organic synthesis. SUBSTANCE: compounds of formula 13: (13), where P2 denotes hydrogen atom or OH-protection group, are prepared by treating compounds of formula 12: (12), with alkyls or Lewis acid in presence of tertiary amine base, said alkyls can be provided by alkylmetal compounds, e.g. tert-butyllithium, and said Lewis acid can be trimethylsilyloxytrifluoroacetate. compounds of formula 15: (16), where and P2 denote independently hydrogen atom or OH-protection group, are prepared by treating compounds of formula 14: P10 (14), with Lewis acid in presence of tertiary amine base. Compounds of formula 11: (11) are also described. EFFECT: expanded synthetic possibilities. 13 cl, 6 dwg |
