一些基于(苯并[ d ]噻唑-2-基)-1-苯基甲胺衍生物的新型抑制剂被设计用于减少阿尔茨海默病的聚集过程。这些结构似乎模仿了二苯乙烯样支架,而苯并噻唑部分“锁定”了硫黄素 T 结合位点。其他抑制剂是基于2-((苯并[ d ]噻唑-2-基亚氨基)甲基)-5-(苄氧基)-1-甲基吡啶-4(H)-酮衍生物设计的。
Organocatalytic asymmetric [4+2] cyclization of 2-benzothiazolimines with azlactones: access to chiral benzothiazolopyrimidine derivatives
作者:Qijian Ni、Xuyang Wang、Fangfang Xu、Xiaoyun Chen、Xiaoxiao Song
DOI:10.1039/d0cc00736f
日期:——
An organocatalytic asymmetricdomino Mannich/cyclization reaction between 2-benzothiazolimines with azlactones has been successfully developed. With the bifunctional squaramide catalyst, this formal [4+2] cyclization occurs with good to high yields and excellent stereoselectivities (up to 99% ee, >20 : 1 dr), providing an efficient and mild access to chiral benzothiazolopyrimidines bearing adjacent
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
A neworganocatalyticstrategy for the synthesis of enantioenriched aza‐Baylis–Hillman type products via a frustrated vinylogous reaction is presented. This process proceeds under mild conditions with good yields, completed Z/E selectivity and excellent enantioselectivities. Moreover, easy derivatizations of the final products led to important building blocks of organic synthesis such as 1,3‐aminoalcohols
Organocatalytic Asymmetric Synthesis of Benzothiazolopyrimidines via [4 + 2] Cyclization of 2-Benzothiazolimines and Aldehydes
作者:Xue-Ping Chen、Ke-Qiang Hou、Feng Zhou、Albert S. C. Chan、Xiao-Feng Xiong
DOI:10.1021/acs.joc.0c02499
日期:2021.1.15
We report the direct asymmetric synthesis of pyrimido[2,1-b]benzothiazoles using a commercially available chiral amine catalyst. A variety of 2-benzothiazolimines and aldehydes were well tolerated under the reaction conditions and generated the corresponding products in 81–99% yields with excellent diastereoselectivities and enantioselectivities (up to >20:1 dr, 99% ee). Furthermore, the products could
我们报告了使用市售手性胺催化剂的嘧啶并[2,1- b ]苯并噻唑的直接不对称合成。在反应条件下,各种2-苯并噻唑啉和醛均具有良好的耐受性,并以81-99%的收率生成了相应的产物,具有非对映选择性和对映选择性(最高> 20:1 dr,99%ee)。此外,产品可以轻松转换为其他有用的手性构件。
Highly enantioselective Mannich reactions of imines with tert-butyl acetoacetate catalyzed by squaramide organocatalyst
作者:Hai-Xiao He、Da-Ming Du
DOI:10.1016/j.tetasy.2014.03.010
日期:2014.4
Highly enantioselective Mannich reactions of iminesbearing a benzothiazolemoiety with tert-butyl acetoacetate, catalyzed by a cinchona-based squaramide organocatalyst have been developed. The corresponding benzothiazole β-keto ester derivatives were obtained in high yields (up to 99%) and with excellent enantioselectivities (up to 98% ee).