Cyclic 3-alkyl-1,2-cyclopentanediones undergo a direct asymmetric oxidation with the DET/Ti(OiPr)(4)/tBuOOH oxidative system, resulting in enantiomeric alpha-hydroxy compounds and ring-cleaved hydroxylated acids (lactones) up to 95% ee. (C) 2000 Elsevier Science Ltd. All rights reserved.
Cyclic 3-alkyl-1,2-cyclopentanediones undergo a direct asymmetric oxidation with the DET/Ti(OiPr)(4)/tBuOOH oxidative system, resulting in enantiomeric alpha-hydroxy compounds and ring-cleaved hydroxylated acids (lactones) up to 95% ee. (C) 2000 Elsevier Science Ltd. All rights reserved.
Asymmetric oxidation of 3-alkyl-1,2-cyclopentanediones. Part 2: Oxidative ring cleavage of 3-alkyl-1,2-cyclopentanediones: synthesis of 2-alkyl-γ-lactone acids
Ti(OiPr)4/diethyl tartrate/tBuOOH system oxidizes 3-alkyl-1,2-cyclopentanediones resulting in hydroxylated ringcleavage products 2-alkyl-γ-lactone acids, in high enantioselectivity (∼95% ee) and satisfactory isolated yields (up to 55%).
Ti(O i Pr)4 /酒石酸二乙酯/ t BuOOH体系氧化3-烷基-1,2-环戊二酮,生成羟化的环裂解产物2-烷基-γ-内酯酸,对映体选择性高(〜95%ee),令人满意单产(最高55%)。
Asymmetric oxidation of 3-alkyl-1,2-cyclopentanediones. Part 1: 3-Hydroxylation of 3-alkyl-1,2-cyclopentanediones
3-Alkyl-1,2-cyclopentanediones undergo asymmetric 3-hydroxylation with the Sharpless Ti-complex resulting in enantiomeric 3-hydroxy carbonyl compounds with ee up to 95% in yields of 22-40%. (C) 2002 Elsevier Science Ltd. All rights reserved.
Asymmetric oxidation of 1,2-cyclopentanediones
作者:Anne Paju、Tõnis Kanger、Tõnis Pehk、Margus Lopp
DOI:10.1016/s0040-4039(00)01106-0
日期:2000.8
Cyclic 3-alkyl-1,2-cyclopentanediones undergo a direct asymmetric oxidation with the DET/Ti(OiPr)(4)/tBuOOH oxidative system, resulting in enantiomeric alpha-hydroxy compounds and ring-cleaved hydroxylated acids (lactones) up to 95% ee. (C) 2000 Elsevier Science Ltd. All rights reserved.