A general and concise stereodivergent chiral pool approach toward trans-(4S,5R)- and cis-(4R,5R)-5-alkyl-4-methyl-γ-butyrolactones: Syntheses of (+)-trans- and (+)-cis-whisky and cognac lactones from d-(+)-mannitol
作者:Avrajit Manna、Ipsita Chakraborty、Sandip Chatterjee、Tanurima Bhaumik
DOI:10.1016/j.carres.2021.108452
日期:2021.12
A straightforward synthesis of (+)-trans-(4S,5R)- and (+)-cis-(4R,5R)-whisky lactones starting from d-(+)-mannitol has been reported here in fewer number of efficient steps compared to existing literature processes involving d-mannitol as the chiral pool starting material. Chiron approach directly translated chirality of d-mannitol to one of the two chiral centers in these target molecules. Toward
从d -(+)-甘露醇开始直接合成 (+)-反式-(4 S ,5 R )- 和 (+)-顺式-(4 R ,5 R )-威士忌内酯的报道较少与涉及d-甘露醇作为手性池起始材料的现有文献方法相比,有效步骤的数量。Chiron 方法直接将d-甘露醇的手性转化为这些靶分子中的两个手性中心之一。为此,立体异构纯的反式和顺式在倒数第二步中形成碘甲基-γ-内酯。这两种作为通用的高级通用中间体也分别转化为 (+)-反式-(4 S ,5 R )- 和 (+)-顺式-(4 R ,5 R )-干邑内酯。据我们所知,迄今为止还没有报道从d-甘露醇开始合成干邑内酯。所有这些内酯都被确定为陈年酒精饮料的关键香气成分。