The Synthesis of Aminobenzothiazoles from 2,3-Biaryl-5-anilino-Δ3-1,2,4-thiadiazolines
摘要:
2-Amidinobenzothiazoles 4 can be prepared in high yields by a thermally-promoted rearrangement of thiadiazolium salts I or thiadiazolines 2. Addition of base to the rearrangement of the thiadiazolium salts can improve the yields by the prior conversion of the thiadiazolium salts to the corresponding thiadiazoline free bases. The rearrangement of the thiadiazolines may go through an electrophilic aromatic substitution or free radical pathway.
A convenient approach for the synthesis of 3,4‐disubstituted 5‐imino‐1,2,4‐thiadiazoles and 2‐aminobenzo[d]thiazoles has been developed using phenyliodine diacetate (PIDA). This approach involves a metal‐free oxidative C−N, N−S and C−S bond formations under neat conditions. High regioselectivity, solvent‐freeconditions, short reaction time and broad functional group compatibility are the notable features
使用苯基乙酸二乙酸酯(PIDA)已开发出一种方便的合成3,4-二取代的5-亚氨基-1,2,4-噻二唑和2-氨基苯并[ d ]噻唑的方法。该方法涉及在纯净条件下形成无金属的氧化性C-N,N-S和C-S键。高区域选择性,无溶剂条件,较短的反应时间和广泛的官能团相容性是本报告的显着特征。
Sodium pyruvate as a peroxide scavenger in aerobic oxidation under carbene catalysis
NHC-Catalyzed aerobicoxidativereactions of imines and aldehydes have been developed by using sodium pyruvate as a novel and efficient peroxide scavenger. A structurally diverse set of imidates and amidines has been prepared fromimines using this strategy. This general and efficient strategy features the use of sodium pyruvate as a novel and efficient peroxide scavenger and ambient air as the sole