摘要:
The invention discloses 2-((2 R ,4 R )-4-(4-(benzyloxy)- 4-methylpent-2-yn-1-yl)-2-(tert-butyl) -5-oxo-1,3-dioxolan-4-yl)acetic acid of formula (XIX), a process for its preparation and processes for its conversion into enantiomerically pure ( R )-2-(2-methoxy-2-oxoethyl)-6,6-dimethyltetrahydro-2 H- pyran-2-carboxylic acid of formula (I), a molecule useful for the synthesis of Homoharringtonine.