The double 1,3-dipolar cycloaddition of allenoates with nitrilimines has been achieved under mild reaction conditions, affording a variety of spirobidihydropyrazoles in moderate to excellent yields with excellent diastereoselectivities. The reaction diastereoselectively constructs double dihydropyrazole moieties and two chiral centers including a spiro carbon center.
Diastereoselective Synthesis of Tetracyclic Tetrahydroquinoline Derivative Enabled by Multicomponent Reaction of Isocyanide, Allenoate, and 2-Aminochalcone
作者:Zhishuang Wang、Youwen Fei、Chongrong Tang、Lei Cui、Jie Shen、Kun Yin、Shanya Lu、Jian Li
DOI:10.1021/acs.orglett.1c00912
日期:2021.6.4
We report here a multicomponent protocol to assemble several polycyclic dihydropyran-fused tetrahydroquinoline structures with excellent diastereoselectivity. This procedure employs simple feedstocks to accomplish a series of diverse structures, which is difficult to attain by traditional sequences.
Phosphine-Catalyzed Domino Reaction of α,β-Unsaturated Ketone and Allenoate: Stereoselective Synthesis of Polysubstituted Dihydro-<i>2H</i>
-Pyran
作者:Jianxiong Li、Yaoyao Chen、Hongdong Yuan、Jie Hu、Yongmei Cui、Meng Yang、Min Li、Jian Li
DOI:10.1002/adsc.201800268
日期:2018.6.15
A phosphine‐catalyzed domino reaction of allenoate and two molecular α,β‐unsaturated ketone is reported. In particular, this unexpected strategy incorporates [2+4] annulation and subsequent Michael addition into one reaction, thus providing a new access to polysubstituted dihydropyran derivatives in an efficient manner. The reaction optimization outcome reveals that not only the catalyst, but also
The thermal [3 + 2] cycloaddition reaction of N-iminoquiazoline ylides with allenoates worked efficiently under mild reaction conditions to provide a variety of tetrahydropyrazoloquinazoline derivatives in good to excellent yields and moderate to excellent diastereoselectivities.
Isocyanide-Based Multicomponent Bicyclization with Substituted Allenoate and Isatin: Synthesis of Unusual Spirooxindole Containing [5.5]-Fused Heterocycle
作者:Zhongzhong Tang、Zhiqiang Liu、Yu An、Ruolan Jiang、Xinglu Zhang、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1021/acs.joc.6b01711
日期:2016.10.7
A three-component bicyclization reaction of isocyanide, substituted allenoate, and isatin has been disclosed. This protocol is proposed to proceed through Michael addition, double cyclization, and [1,5]-hydride shift sequence, thus leading to the formation of two new rings and five new chemical bonds, including C–C, C–O, and C–N bonds.