1,4-(di-tert-butoxycarbonyl)-4-hydroxy-3-pyrrolidinone | 1180519-47-4

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 哌啶类
• 英文名称: 1,4-(di-tert-butoxycarbonyl)-4-hydroxy-3-pyrrolidinone
• CAS: 1180519-47-4
• 化学式: C₁₄H₂₃NO₆
• 分子量: 301.34
• InChiKey: VOAUKFXSQGKPEJ-AWEZNQCLSA-N

反应信息

• 作为产物：
  描述：

  (+/-)-4-oxopyrrolidine-1,3-dicarboxylic acid di-tert-butyl ester 在 [(R)-(+)-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl]-diaquo-palladium(II) bis(triflate) 、 二甲基二环氧乙烷 作用下， 以 二氯甲烷 为溶剂， 反应 0.5h， 以93%的产率得到1,4-(di-tert-butoxycarbonyl)-4-hydroxy-3-pyrrolidinone
  参考文献：
  名称：

  Palladium-catalysed enantioselective α-hydroxylation of β-ketoesters

  摘要：

  使用双阳离子钯(II) 催化剂和二甲基二氧杂环己烷作为氧化剂，可以实现环状和无环1,3-酮酯的高度对映选择性α-羟基化，EE 高达 98%。

  DOI：

  10.1039/b907151b

文献信息

• Delineating Origins of Stereocontrol in Asymmetric Pd-Catalyzed α-Hydroxylation of 1,3-Ketoesters
  作者：Alexander M. R. Smith、Henry S. Rzepa、Andrew J. P. White、Denis Billen、King Kuok (Mimi) Hii

  DOI：10.1021/jo1002906

  日期：2010.5.7

  Systematic studies of reaction conditions and subsequent optimization led to the identification of important parameters for stereoselectivity in the asymmetric alpha-hydroxylation reaction of 1,3-ketoesters. Enantioselectivities of up to 98% can be achieved for cyclic substrates and 88% for acyclic ketoesters. Subsequently, the combination of cyclic/acyclic ketoester, catalyst, and oxidant was found to have a profound effect on reaction rates and turnover-limiting steps. The stereochemistry of the reaction contradicts that observed for other similar electrophilic substitution reactions. This was rationalized by transition-state modeling, which revealed a number of cooperative weak interactions between oxidant, ligand, and counterion, together with C-H/pi interactions that cumulatively account for the unusual stereoselectivity.