Triple Role of Phenylselenonyl Group Enabled a One-Pot Synthesis of 1,3-Oxazinan-2-ones From α-Isocyanoacetates, Phenyl Vinyl Selenones, and Water
摘要:
Reaction of alpha-substituted alpha-isocyanoacetates with phenyl vinyl selenones in the presence of a catalytic amount of base (DBU or Et3N, 0.05-0.1 equiv) followed by addition of p-toluenesulfonic acid (PTSA, 0.1-0.2 equiv) afforded 4,4,5-trisubstituted 1,3-oxazinan-2-ones in good to excellent yields. Enantiomerically enriched heterocycles can also be prepared using a Cinchona alkaloid-derived bifunctional organocatalyst for the Michael addition step. The phenylselenonyl group served as an activator for the Michael addition, a leaving group and a latent oxidant in this integrated reaction sequence.
Chemical labeling achieves 8-oxo-7,8-dihydroguanine mapping in the microRNA transcriptome
作者:Changjiang Fan、Xinyue Meng、Wei Yang、Peiyan Wang、Wenguang Chang、Peifeng Li、Jianxun Wang
DOI:10.1039/d2cc06273a
日期:——
A robust methodology, APSC-8-oxoGua-seq, for the sequencing of 8-oxoGua in the microRNA transcriptome at the single-base resolution has been developed.