A Cp*RhIII‐catalyzed annulative carbooxygenation of challenging 1,1‐disubstituted alkenes triggered by C−Hactivation of N‐aryloxyacetamides has been established, which affords 2,3‐dihydrobenzofuran derivatives with a quaternary carbon center in good to excellent yields under mild redox‐neutral conditions. An amide group on the alkenes is essential for the process, and may inhibit the β‐H elimination
已经建立了Cp * Rh III催化的N-芳氧基乙酰胺的CH活化触发的具有挑战性的1,1-二取代烯烃的环状碳氧加合反应,该化合物可以在良好的收率下,以良好的收率提供具有季碳中心的2,3-二氢苯并呋喃衍生物。轻度氧化还原中性条件。烯烃上的酰胺基对于该过程至关重要,并且可能通过配位使铑中心饱和而抑制C(sp3-)-Rh物种中β-H的消除。此外,从控制实验中获得的机械学见解表明,涉及一种Rh III -Rh V -Rh III催化循环的机理。
(3SR, 4RS)-3-((RS)-1-hydroxyethyl)- and -((RS)-1-acyloxyethyl)-2-oxo-4-azetidineacetic acid compounds and a process for preparing the same
申请人:Merck & Co., Inc.
公开号:EP0032400A1
公开(公告)日:1981-07-22
Disclosed is a process comprising the steps of treating a compound of the formula:
with a carboxylic acid R4CO2H in the presence of a triorganophosphine and an activating agent therefor to prepare a compound of the formula:
followed by hydrolysis to cleave COR4; wherein R' is hydrogen or a readily removable protecting group and R4CO is a readily removable acyl radical.
This process can be used for the stereocontrolled total synthesis of thienamycin.
Use of N-haloamides as photoinitiators for free-radical polymerizations
申请人:MINISTERO DELL' UNIVERSITA' E DELLA RICERCA SCIENTIFICA E TECNOLOGICA
公开号:EP0458197A2
公开(公告)日:1991-11-27
Disclosed are N-haloamide photoinitiator compositions for free-radical polymerizations, comprising at least one compound of general formula (I):
R - CO - NHX (I)
wherein
Rrepresents an optionally substituted alkyl, cycloalkyl, aryl, alkyl-aryl or aryl-alkyl or heterocyclic group and
Xis Cl, Br or I.
公开了用于自由基聚合的 N-卤酰胺光引发剂组合物,其中包含至少一种通式 (I) 的化合物:
R - CO - NHX (I)
其中
R 代表任选取代的烷基、环烷基、芳基、烷基芳基或芳基烷基或杂环基团,以及
Xis Cl、Br 或 I。
Lessard, Jean; Mondon, Martine; Touchard, Daniel, Canadian Journal of Chemistry, 1981, vol. 59, p. 431 - 450
作者:Lessard, Jean、Mondon, Martine、Touchard, Daniel
DOI:——
日期:——
Roesch, W.; Regitz, M., Synthesis, 1987, # 8, p. 689 - 693