derivatives of D-threo configuration were prepared starting with D-arabinose and D-galactose, respectively. Their dianions served for nucleophilic additions to model aldehydes, thus comprising syntheses of the complex side chain of chromomycinone. In contrast to former reports a trianion formation of a dithiane-blocked α,β-dihydroxy aldehyde could not be confirmed.
分别从
D-阿拉伯糖和
D-半乳糖开始制备合适的D-苏式构型的二
噻吩衍
生物。它们的二价阴离子用于模型醛的亲核加成,因此包括色霉素的复杂侧链的合成。与以前的报道相反,不能确定由二
噻吩嵌段的α,β-二羟基醛的三价阴离子形成。