A new route to the asymmetric synthesis of (−)-malyngolide and (−)-epi-malyngolide using N-sulfonyl-1,3-oxazolidines as chiral auxiliaries
作者:Eric Winter、Dieter Hoppe
DOI:10.1016/s0040-4020(98)00488-8
日期:1998.8
(−)-Malyngolide (1), an antibiotically active δ-lactone, and its epimer 10 were prepared enantioselectively using [2R,2(1S),4R]- and [2R,2(1S),4R]-4-ethyl-3-(2-nitrobenzenesulfonyl)-2-(1-nonyl-2-oxocyclopentyl)-1,3-oxazolidine (5a and 5b) as key-intermediates. Furthermore, a new cleavage procedure for the chiral auxiliary is reported.
使用[2 R,2(1 S),4 R ]-和[2 R,2(1 S),4 ]对映选择性地制备具有抗菌活性的δ-内酯(-)-Malyngolide(1)及其差向异构体10。作为关键中间体,R ] -4-乙基-3-(2-硝基苯磺酰基)-2-(1-壬基-2-氧代环戊基)-1,3-恶唑烷(5a和5b)。此外,已报道了一种用于手性助剂的新裂解方法。