A novel method for the asymmetric synthesis of both enantiomers of 2, 3-disubstituted-butanolides (8) was devised using a readily available (S)-4-hydroxymethyl-4-butanolide 4-derivative (6) as a chiral source in the asymmetric induction and as the carbon framework of 8. Application of this method to the asymmetric total synthesis of podorhizon (23) and deoxypodorhizon (4) is described.
设计了一种新颖的方法,用于合成2,3-二取代
丁醇内酯(8)的两种对映异构体,该方法利用易于获得的(S)-4-羟甲基-4-
丁醇内酯4-衍
生物(6)作为手性诱导源和8的碳骨架。本文描述了这种方法在不对称全合成podorhizon(23)和deoxypodorhizon(4)中的应用。