Indole-fused cyclic anhydrides earlier deemed unreactive in the Castagnoli-Cushman reaction with imines have been rendered valid participant in this process. The new reaction format involves the use of respective indole-based dicarboxylic acids and in situ cyclodehydration of the latter by aceticanhydride. This finding validates a fundamentally new approach to synthesizing compounds based on the privileged
早先被认为在Castagnoli-Cushman与亚胺的反应中没有反应性的吲哚稠合的环状酸酐已成为该过程的有效参与者。新的反应形式包括使用各自的基于吲哚的二羧酸和后者通过乙酸酐的原位环脱水。这一发现证实了一种根本上新颖的合成化合物的方法,该方法基于特权的1,2,3,4-四氢吡嗪并[1,2- a ]吲哚核,其特征是迄今未描述的取代方式。
作者:A. Sudhakara、H. Jayadevappa、K. M. Mahadevan、Vijaykumar Hulikal
DOI:10.1080/00397910802656059
日期:2009.6.23
Abstract An efficient one-pot procedure for the synthesis of 2-ethoxycarbonyl indoles from commercially available materials has been developed. The one-step procedure involves in situ formation of the hydrazones from phenylhydrazine hydrochloride and ethyl pyruvate in the presence of bismuth nitrate followed by Fischer cyclization in polyphosphoric acid and ethanol. This method is efficient and simple
Cleavage of 2-acetyl-2-phenylazopropionanilide and related compounds by boron trifluoride. New Japp–Klingemann reactions
作者:G. C. Barrett、M. M. El-abadelah、M. K. Hargreaves
DOI:10.1039/j39700001986
日期:——
2-Acetyl, 2-cyano-, and 2-nitro-2-phenylazopropionic acid derivatives suffer cleavage of the phenylazo-grouping on treatment with borontrifluoride, giving benzenediazonium tetrafluoroborate and the corresponding difluoroboron propionic acid derivative; 2-cyano- or 2-nitro-2-phenylazoisobutyronitrile and the corresponding amides behave similarly, but 1-phenylazo-2-naphthol gives a difluoroboron salt, and