Stereoselective synthesis of (±)-methyl nonactate and (±)-methyl 8-epi-nonactate.
作者:Barry Lygo、Norval O'Connor
DOI:10.1016/s0040-4039(00)95545-x
日期:1987.1
(±)-Methyl nonactate (2) and (±)-methyl 8-epi-nonactate (3), synthetic precursors to the antibiotic nonactin have been synthesised, employing the reaction of substituted epoxides with dianions derived from β-ketoesters as the key carbon—carbonbond-forming step.
Stereoselective synthesis of (±)-methyl homononactate and (±)-methyl 8-epi-homononactate
作者:Barry Lygo
DOI:10.1016/s0040-4020(01)86218-9
日期:1988.1
A stereoselective route to (±)-methyl homononactate (4b) and (±)-methyl 8-epi-homononactale (5b), synthetic precursors to the antibiotic tetranactin, is presented. Key steps involve employing the regioseleclive ring opening of l-(benzyloxy)but-3-ene oxide (8) with the dianion derived from methyl(2-methyl, 3-oxo)butanoate (9), and the stereoselective addition of dialkyl zinc species to a β-alkoxyaldehyde