Saleh, Nidal published the artcileSynthesis of 9H-Pyrrolo[1,2-a]indole and 3H-Pyrrolizine Derivatives via a Phosphine-Catalyzed Umpolung Addition/Intramolecular Wittig Reaction, Formula: C9H6FNO, the publication is Journal of Organic Chemistry (2016), 81(10), 4371-4377, database is CAplus and MEDLINE.
The first umpolung addition/intramol. Wittig reaction, catalytic in phosphine, is described. The in situ phosphine oxide reduction was accomplished by the use of silane and a catalytic amount of bis(4-nitrophenyl)phosphate. This catalytic protocol is applicable to the synthesis of a wide range of functionalized 9H-pyrrolo[1,2-a]indoles and pyrrolizines (18 examples, 70-98% yields).
Journal of Organic Chemistry published new progress about 220943-23-7. 220943-23-7 belongs to indole-building-block, auxiliary class Indole,Fluoride,Aldehyde, name is 5-Fluoro-1H-indole-2-carbaldehyde, and the molecular formula is C9H6FNO, Formula: C9H6FNO.
Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles