Copper-catalyzed N-methylation/ethylation of sulfoximines
作者:Fan Teng、Jiang Cheng、Jin-Tao Yu
DOI:10.1039/c5ob01558h
日期:——
A protocol for the copper-catalyzed N-methylation of sulfoximines with di-tert-butyl peroxide (DTBP) was developed. This protocol has good functional group tolerance leading to N-methylated sulfoximines in moderate to good yields. Besides, N-ethylation of sulfoximines was achieved in the presence of bis(1,1-dimethylpropyl)peroxide as the ethylating agent under a standard procedure.
N-methylation of sulfoximines using methylboronic acid is reported. The reactions provide excellent yields in a short span of time under mild conditions. The optimized conditions were also found to be suitable for the N-alkylation of sulfoximine with different alkylboronic acids. In addition, N-methylation and cyclopropylation of the bioactive L-methionine sulfoximine derivative was demonstrated under standard
formation reaction of simple NH-sulfoximines with 1,4,2-dioxazol-5-ones to produce diverse thiadiazine-1-oxides is reported. The reaction tolerates a broad range of functional groups under external oxidant-free conditions and only releases CO2 and H2O as the sole byproducts. The preliminary mechanistic studies revealed an electrophilic metalation pathway is likely involved in the reaction.
微波辅助的Cp * Co III催化的简单N H-亚磺酰亚胺与1,4,2-二恶唑-5-酮的直接C–H活化/双C–N键形成反应,生成各种噻二嗪-1-氧化物。被报道。在无外部氧化剂的条件下,该反应可耐受各种官能团,并且仅释放出CO 2和H 2 O作为唯一的副产物。初步的机理研究表明,该反应可能涉及亲电性金属化途径。
Iridium(III)-Catalyzed C–H Amidation/Cyclization of <i>NH</i>-Sulfoximines with <i>N</i>-Alkoxyamides: Formation of Thiadiazine 1-Oxides
The first example of Ir(III)-catalyzed C-H activation/cyclization with N-alkoxyamides as amidation reagents to simultaneously form functionalized thiadiazine 1-oxide derivatives was developed. This one-pot cascade protocol tolerated diverse functional groups and readily constructed various heterocyclic frameworks in moderate to good yield.