Bicyclic thiaspiro[4.n]alkanones: Investigating their total stereochemistry achieved by the catalyst-free sulfa-Michael reaction
作者:Alex Ketzer、Érica G. Oliveira、Sarah F. Coelho、Yuri G. Kappenberg、Felipe S. Stefanello、Nilo Zanatta、Marcos A.P. Martins、Clarissa P. Frizzo、Helio G. Bonacorso
DOI:10.1016/j.molstruc.2022.133617
日期:2022.11
A series of twenty-two examples of bicyclic 1-aryl-4-hydroxy-2-thiaspiro[4.n]alkanones (3, 4), where aryl = phenyl, 4-CH3OC6H4, 4-NO2C6H4, 4-FC6H4, 4-ClC6H4, 4-CH3C6H4,1-naphthyl, 4-N(CH3)2C6H4, and n = 4, 5 were obtained from a catalyst-free sulfa-Michael reaction in refluxing ethanol as a solvent at up to 98% of yield, starting from the readily available 2-arylidene-cycloalkanones (1) and 1,4-dithian-2
一系列 22 个双环 1-aryl-4-hydroxy-2-thiaspiro[4.n]alkanones ( 3, 4 ) 的例子,其中芳基 = 苯基,4-CH 3 OC 6 H 4,4-NO 2 C 6 H 4 , 4-FC 6 H 4 , 4-ClC 6 H 4 , 4-CH 3 C 6 H 4 ,1-萘基, 4-N(CH 3 ) 2 C 6 H 4, 和 n = 4, 5 是在回流乙醇作为溶剂中通过无催化剂磺胺-迈克尔反应获得的,产率高达 98%,从容易获得的 2-亚芳基-环烷酮 ( 1)和 1,4- dithian-2,5-diol ( 2 ) 作为前体。乙烯基酮1是通过简单的环戊酮和环己酮与芳基醛通过完善的程序进行反应来合成的。随后,致力于通过 NMR 和 SC-XRD 技术进行分离、结构表征和配置分配,以识别在双环支架 ( 3, 4 ) 处含有多个手性中心的非对映异构体,并与之前的研究进行了介绍、讨论和比较。