A facile N-heterocyclic carbene catalytic enantioselective aza-Diels–Alder reaction of oxodiazenes with α-chloroaldehydes as dienophile precursors is reported, with excellent enantioselectivity (ee > 99%) and excellent yield (up to 93%). DFT study showed that cis-TSa, formed from a top face approach of oxodiazene to cis-IIa, is the most favorable transition state and is consistent with the experimental
(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