Unexpected tandem ylide annulation reaction for controllable synthesis of 2H-chromenes and 4H-chromenes.
[reaction: see text] An unexpected tetrahydrothiophene-catalyzed ylide annulation reaction, via tandem Michael addition/elimination/substitution, for the controllable synthesis of 2H-chromenes and 4H-chromenes has been developed.
Ye
Long-Wu
LW
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, PRC.
Sun
Xiu-Li
XL
Zhu
Chun-Yin
CY
Tang
Yong
Y