An enantioselective synthesis of the C(10) to C(20) fragment of FK506
摘要:
The synthesis of the C(10) to C(20) fragment 4 of FK506 from (4S)-4-[(tert-butyldimethylsilyl)-oxymethyl]-4-butanolide (9) is described. A key reaction is the chelation controlled addition of 2-lithio-4-methyl-furan (15b) to aldehyde 8.