Total synthesis of milbemycin G: synthesis of the C(1)–C(10) fragment
作者:Simon Bailey、Aphiwat Teerawutgulrag、Eric J. Thomas
DOI:10.1039/c39950002519
日期:——
The hydroxybutenolide 5, a precursor of the C(1)âC(10) fragment of the 5-methoxy a-miibemycins, is synthesised by stereo- and regio-selective modification of the hydroxycyclohexanone 8.
Total synthesis of milbemycins: a synthesis of (6R)-6-hydroxy-3,4-dihydromilbemycin E
作者:Madeleine Helliwell、Sufia Karim、Emma R. Parmee、Eric J. Thomas
DOI:10.1039/b508670a
日期:——
of the corresponding (9Z,2'E)-isomers 60 and 61. (2'Z)/(2'E)-Isomerisation of the dienes 58 and 59 using iodine followed by deprotection gave a mixture of the seco-acids 62 and 63. Selective macrocyclisation of the seco-acid 62 in which the relative configuration of the C1-C7 and C17-C19 fragments (milbemycin numbering) corresponded to that present in the natural milbemycins, gave the beta-milbemycin