Chiral guanidine catalyzed cyclization reactions of 1,3-enynes for lactone synthesis: switchable H-bond catalysis
Yongyan Zhang(Sichuan University), Lichao Ning(Sichuan University), Tianxin Zhu(Sichuan University), Xie Zheng(Sichuan University), Shunxi Dong(Sichuan University), Xiaoming Feng(Sichuan University), Xiaohua Liu(Sichuan University)
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Abstract
Cyclization and 1,4-conjugate addition/cyclization between 2-activated 1,3-enynes and azlactones were achieved with chiral guanidine-amides for enol-type activation to yield a range of δ-lactone derivatives.
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