Asymmetric Michael/hemiketalization of 5-hydroxy-2-methyl-4H-pyran-4-one to β,γ-unsaturated α-ketoesters catalyzed by a bifunctional rosin–indane amine thiourea catalyst
作者:B. V. Subba Reddy、Manisha Swain、S. Madhusudana Reddy、J. S. Yadav、B. Sridhar
DOI:10.1039/c4ra06938b
日期:——
A highly efficient enantioselective Michael-hemiketalization cascade process is reported using a chiral bifunctional rosin–indane amine thiourea catalyst.
报道了一种使用手性双功能松香-茚胺硫脲催化剂的高效对映选择性Michael-半缩醛化级联过程。
Design, synthesis and biological evaluation of diamino substituted cyclobut-3-ene-1,2-dione derivatives for the treatment of drug-resistant tuberculosis
作者:Peng Li、Bin Wang、Gang Li、Lei Fu、Dongfeng Zhang、Ziyun Lin、Haihong Huang、Yu Lu
DOI:10.1016/j.ejmech.2020.112538
日期:2020.11
Mycobacteriumtuberculosis (Mtb) ATP synthase is an important target for treating drug-resistant infections and sterilizing the bacteria, spurring intensive efforts to develop new TB therapeutics based on this target. In this work, four novel series including furan-2(5H)-ketone (3, 4), maleimide (5) and squaramide (6) derivatives were designed, respectively, through the strategy of scaffold morphing
Highly Enantioselective Michael Addition of Nitroalkanes to Chalcones Using Chiral Squaramides as Hydrogen Bonding Organocatalysts
作者:Wen Yang、Da-Ming Du
DOI:10.1021/ol102294g
日期:2010.12.3
squaramide-based organocatalysts were facilely synthesized and applied as hydrogen bonding organocatalysts in the enantioselectiveMichaeladdition of nitroalkanes to chalcones. These organocatalysts promoted the Michaeladdition with low catalyst loading under high temperature (80 °C), affording the desired R or S enantiomers of the products flexibly in high yields with excellent enantioselectivities (93−96%
A Bifunctional Cinchona Alkaloid-Squaramide Catalyst for the Highly Enantioselective Conjugate Addition of Thiols to trans-Chalcones
作者:Le Dai、Su-Xi Wang、Fen-Er Chen
DOI:10.1002/adsc.201000334
日期:2010.9.10
A chiral squaramide catalysts‐promoted asymmetric sulfa‐Michael conjugated addition of thiols to trans‐chalcones is presented. Moderate to excellent yields and high enantioselectivities (up to 99% ee) were achieved under mild conditions.
squaramides were prepared in a straightforward manner and investigated as organocatalysts. The reaction protocol is operationally simple to execute and proceeds with up to 76% enantiomeric excess. Several conditions, additives, catalysts, and substrates have been investigated. The best results were observed with 3-((3,5-bis(trifluoromethyl)phenyl)amino)-4-(((1R,2R)-2-(dipentylamino)cyclohexyl)amino)-cyclobut-3-ene-1