α-苯硫醛可以使用简单的多步骤程序轻松制备,本文中将其作为 NHC 催化生成酰基唑鎓和烯醇化唑鎓中间体的新前体引入,这些中间体具有广泛的合成兴趣和实用性。用 NHC 预催化剂和碱处理 α-苯硫醛,通过Breslow 中间体产生有效的氧化还原重排,消除苯硫酚盐,随后回弹加成至生成的酰基唑鎓,得到相应的硫羟酸酯。在外部醇存在的情况下,氧化还原重排和氧化还原酯化之间的竞争可以通过明智地选择NHC预催化剂内的N-芳基取代基和反应中使用的碱来控制。以NEt 3为基体,带有吸电子( N -C 6 F 5或N -C 6 H 2 Cl 3 )取代基的NHC有利于氧化还原重排,而带有富电子N-芳基取代基( N -Ph, N )的三唑鎓预催化剂-Mes) 导致优先氧化还原酯化。使用DBU时,由于最初形成的硫羟酸酯产物发生酯交换反应,因此优选氧化还原酯化反应。此外,α-苯硫醛衍生的唑鎓烯醇化物已用于对映选择性形式[4
The present invention relates to specific beta-lactone compounds and compositions thereof for the treatment of infections, such as, e.g., infections with bacteria or infections with protozoa, in particular infections with Gram-positive and/or Gram-negative bacteria and of infectious diseases caused by or related to Gram-positive and/or Gram-negative bacteria, and to the modulation of virulence of Gram-positive and/or Gram-negative bacteria or of protozoa by specific beta-lactone compounds. The invention further relates to the use of the compounds or compositions for preventing or eliminating biofilms.
The present invention relates to specific beta-lactone compounds and compositions thereof for the treatment of infections, such as, e.g., infections with bacteria or infections with protozoa, in particular infections with Gram-positive and/or Gram-negative bacteria and of infectious diseases caused by or related to Gram-positive and/or Gram-negative bacteria, and to the modulation of virulence of Gram-positive and/or Gram-negative bacteria or of protozoa by specific beta-lactone compounds. The invention further relates to the use of the compounds or compositions for preventing or eliminating biofilms.
A practical and efficient method for the synthesis of .beta.-lactones
作者:Rick L. Danheiser、James S. Nowick
DOI:10.1021/jo00003a047
日期:1991.2
This paper describes a convenient one-step preparation of beta-lactones based on the addition of thiol ester enolates to carbonyl compounds. Under the proper conditions the resulting aldolates undergo spontaneous cyclization to produce beta-lactones in good to excellent yield. The new beta-lactone synthesis provides access to 2-oxetanones with a variety of substituents and substitution patterns. In general, thiol ester enolates combine with carbonyl compounds to form the less sterically crowded beta-lactone diastereomers, and in some cases the reaction proceeds with excellent stereoselectivity. In conjunction with the stereospecific decarboxylation of beta-lactones, this chemistry also provides a very attractive approach to the synthesis of substituted alkenes.
SYNTHESIS OF b-LACTONES AND ALKENES VIA THIOL ESTERS: (E)-2,3-DIMETHYL-3-DODECENE
作者:Danheiser, Rick L.、Nowick, James S.、Lee, Janette H.、Miller, Raymond F.、Huboux, Alexandre H.、Mathre, David J.、Shinkai, Ichiro
DOI:10.15227/orgsyn.073.0061
日期:——
β-Lactones as Privileged Structures for the Active-Site Labeling of Versatile Bacterial Enzyme Classes