Chiral squaramides as highly enantioselective catalysts for Michael addition reactions of 4-hydroxycoumarins and 4-hydroxypyrone to beta,gamma-unsaturated alpha-keto esters.
Xu
Dan-Qian
DQ
State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China.
Wang
Yi-Feng
YF
Zhang
Wei
W
Luo
Shu-Ping
SP
Zhong
Ai-Guo
AG
Xia
Ai-Bao
AB
Xu
Zhen-Yuan
ZY
D015110:4-Hydroxycoumarins / Q000737:chemistry*; D002384:Catalysis; D003503:Cyclobutanes / Q000737:chemistry*; D004952:Esters / Q000737:chemistry; D006860:Hydrogen Bonding; D007659:Ketones / Q000737:chemistry*; D015394:Molecular Structure; D011753:Pyrones / Q000737:chemistry*; D013237:Stereoisomerism; D013449:Sulfonamides / Q000737:chemistry*
D015110:4-Hydroxycoumarins; C550810:4-hydroxypyrone; D003503:Cyclobutanes; D004952:Esters; D007659:Ketones; D011753:Pyrones; D013449:Sulfonamides; C527748:squaric acid amide