A Domino Amidation Route to Indolines and Indoles: Rapid Syntheses of Anhydrolycorinone, Hippadine, Oxoassoanine, and Pratosine
摘要:
When subjected to palladium-catalyzed amidation conditions, 2-triflyloxy phenethyl carbonates undergo, in addition to the expected aryl cross-coupling, an additional amidation with net displacement of the carbonate. The result is a one-step synthesis of indolines which may be oxidized to indoles. The utility of the procedure is illustrated by the two- or three-step syntheses of anhydrolycorinone, hippadine, oxoassoanine, and pratosine.
Simple Synthesis of Amides and Weinreb Amides Using PPh3 or Polymer-Supported PPh3 and Iodine
作者:Amit Kumar、Hari Kiran Akula、Mahesh K. Lakshman
DOI:10.1002/ejoc.200901420
日期:2010.5
range of carboxylic acids to 2 degrees , 3 degrees , and Weinrebamides. Simplification of the procedure was possible with the use of polymer-supported PPh3/I2. Weinrebamides produced via the use of polymer-supportedPPh3 could be filtered through a short silica gel plug and used in further transformations. Thus, use of polymer-supportedPPh3 offers potential applicability to diversity-oriented reactions
已经证明,PPh 3 / I 2的组合对于将一系列羧酸转化为2度,3度和Weinreb酰胺是有效的。使用聚合物负载的PPh3 / I2可以简化程序。通过使用聚合物负载的PPh3制备的Weinreb酰胺可以通过短硅胶塞过滤,并用于进一步的转化。因此,使用聚合物负载的PPh3可为面向多样性的反应提供潜在的适用性。通过使用这种酰胺形成方法,已经完成了载脂蛋白和普拉托恩的正式全部合成,以及脱水胆碱酮和马来帕定的合成。已尝试获得对该反应的了解。
Synthetic Studies on Pyrrolophenanthridone Skeleton from 1-Benzoyl-7-iododihydroindole Derivatives Using Palladium-assisted Biaryl Coupling Reactions
The biaryl coupling reaction of 1-benzoyl-7-iododihydroindole derivatives using Pd reagent was examined. 1-[(1,3-Benzodioxol-5-yl)carbonyl]-7-iodo-2,3-dihydroindole gave 4,5-dihydro-7H-[1,3]dioxolo[4,5-k]pyrrolo[3,2,1-de]phenanthridin-7-one, which was formed by connection to a more hindered carbon, as a major product. 1-(3,4-Dimethoxybenzoyl)-7-iodo-2,3-dihydroindole gave oxoassoanine and 10,11-dimethoxy-4,5-dihydropyrrolo[3,2,1-de]phenanthridin-7-one in an almost equal ratio.
A direct synthesis of pyrrolophenanthridone alkaloids
作者:David St C. Black、Paul A. Keller、Naresh Kumar
DOI:10.1016/s0040-4039(00)76203-4
日期:1989.1
Cook et al., Journal of the Chemical Society, 1954, p. 4176,4180
作者:Cook et al.
DOI:——
日期:——
Synthesis of anhydrolycorine and dimethylapoerysopine