Xiao, Qian; Lu, Maojian; Deng, Yinglan; Jian, Jing-Xin; Tong, Qing-Xiao; Zhong, Jian-Ji published their research in Organic Letters in 2021. The article was titled 《Photoinduced Radical Cascade Cyclization: A Metal-Free Approach to Access Difluoroalkylated Dioxodibenzothiazepines》.Reference of 4-Chloro-2-iodoaniline The article contains the following contents:
A simple and mild photoredox catalytic approach to access difluoroalkylated dioxodibenzothiazepines I [R1 = Me, Bz, cyclohexyl, etc.; R2 = CO2Et, C(O)NEt2, P(O)(OEt)2, etc.; R3 = H, Me, Ph, etc.; R4 = H, F, Cl, Br; R5 = H, Me, F, Cl, Br; R6 = H, Me, Cl, etc.] in high regioselectivity via radical cascade cyclization was described. In contrast to previous methods, this strategy did not involved the use of transition-metal catalysts and avoided the potential disadvantages of inevitable toxicity and the tedious removal process of metal catalysts. The com. available and inexpensive CF2 precursors, wide substrate scope and mild reaction conditions demonstrated the practicability of this approach. In the experiment, the researchers used 4-Chloro-2-iodoaniline(cas: 63069-48-7Reference of 4-Chloro-2-iodoaniline)
4-Chloro-2-iodoaniline(cas: 63069-48-7) belongs to anime. Nitrous acid converts secondary amines (aliphatic or aromatic) to N-nitroso compounds (nitrosamines): R2NH + HNO2 → R2N―NO. Some nitrosamines are potent cancer-inducing substances, and their possible formation is a serious consideration when nitrites, which are salts of nitrous acid, are present in foods or pharmaceutical preparations. Tertiary amines give rise to nitrosamines more slowly; an alkyl group is eliminated as an aldehyde or ketone, along with nitrous oxide, N2O.Reference of 4-Chloro-2-iodoaniline
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com