(PBu3)-promoted annulation reaction at room temperature. In this synthetic process, crude less stable N-aroyldiazene intermediates generated by I2-mediated oxidation of hydrazides were used directly in a subsequent annulation reaction to afford the selenadiazole products. The merits of the present synthetic strategy also include absence of transition metals and gram-scale synthesis.
2-亚氨基-1,3,4-硒二唑衍生物可以在室温下通过连续氧化和三丁基膦 (PBu 3 ) 促进的环化反应从酰肼和异硒氰酸酯合成。在该合成过程中,由 I 2 -介导的酰肼氧化产生的较不稳定的粗N-芳酰基二氮中间体直接用于随后的环化反应,以提供硒二唑产物。本合成策略的优点还包括没有过渡金属和克级合成。
One‐pot synthesis of 2‐imino‐1,3,4‐thiadiazolines from acylhydrazides and isothiocyanates
作者:Su Been Kim、Sang Eun Baek、Jae Hyeok Lim、Jinho Kim
DOI:10.1002/bkcs.12585
日期:2022.8
A one-pot synthesis of 2-imino-1,3,4-thiadiazolines was successfully achieved under mild conditions. The developed synthesis involves Fe(Pc)-catalyzed aerobic oxidation of acylhydrazides followed by P(NMe2)3-mediated annulation of the in situ generated N-acyldiazene with isothiocyanates. The present annulation showed broad substrate scope with good functional group tolerance, and was effective on gram
Ponzio, Gazzetta Chimica Italiana, 1909, vol. 39 II, p. 323
作者:Ponzio
DOI:——
日期:——
Ponzio; Charrier, Gazzetta Chimica Italiana, 1909, vol. 39 I, p. 633
作者:Ponzio、Charrier
DOI:——
日期:——
DMAP-Catalyzed [2 + 4] Cycloadditions of Allenoates with <i>N</i>-Acyldiazenes: Direct Method to 1,3,4-Oxadiazine Derivatives
作者:Qi Zhang、Ling-Guo Meng、Jinfeng Zhang、Lei Wang
DOI:10.1021/acs.orglett.5b01237
日期:2015.7.2
An efficient DMAP-catalyzed [2 + 4] cycloaddition of allenoates and N-acyldiazenes is reported. The reaction involved embeddhig three heteroatoms into a six-membered ring and generated 1,3,4-oxadiazine derivatives in moderate to good yields.