Stereoselective syntheses and reactions of chiral oxygenated α,β-unsaturated-γ- and δ-lactones
作者:Francisco Sánchez-Sancho、Serafín Valverde、Bernardo Herradón
DOI:10.1016/0957-4166(96)00424-7
日期:1996.11
The syntheses of the chiral α,β-unsaturated lactones (+)-5, (−)-6, (+)-8, (+)-9, and (+)-10 have been efficiently achieved from readily available starting materials. The lactone (+)-5 has been synthesized in 7 steps from (R,R)-dimethyl tartrate (38–43% overall yield). The use of (+)-5 in formal syntheses of natural (+)-asperlin 4 and advanced intermediates for (+)-olguine 2 are also reported. The lactone
手性α,β-不饱和内酯(+)- 5,(-)- 6,(+)- 8,(+)- 9和(+)- 10的合成已从容易获得的起始原料中高效地获得。内酯(+)- 5已由(R,R)-酒石酸二甲酯(7-43%的总产率)分7个步骤合成。还报道了在天然(+)-asperlin 4和(+)-olguine 2的高级中间体的正式合成中使用(+)- 5。内酯(-)- 6已从(R-苹果酸(总收率44-50%)。对于分支链和脱氧核苷类似物的合成,它可能是有用的前体。(-)- 6的制备构成了天然(+)-艾加醇化物53和(+)-Geissman-Waiss内酯54(用于合成多种吡咯烷核生物碱的中间体)的形式合成。内酯(+)- 8,(+)- 9和(+)- 10已由3,4-二-O-乙酰基-L-鼠李糖醇58合成。(+)- 9和(+)- 10的高度非对映选择性转化,通过顺序的共轭亲核加成和烯醇酸酯反应,转变为致密官能化的手性γ-内酯还报告了12个。