Enantioselective Synthesis of Multifunctionalized 4<i>H</i>-Pyrans via Formal [4 + 2] Annulation Process by Bifunctional Phosphonium Salt Catalysis
作者:Jia-Hong Wu、Jianke Pan、Juan Du、Xiaoxia Wang、Xuemei Wang、Chunhui Jiang、Tianli Wang
DOI:10.1021/acs.orglett.9b04079
日期:2020.1.17
highly enantioselective formal [4 + 2] annulation involving electron-deficient allenes as C2-synthons has been developed under bifunctional phosphonium salt catalysis. With this catalytic protocol, a wide range of synthetically interesting and highly functionalized chiral 4H-pyran derivatives were readily prepared in good yields (up to 99%) with outstanding diastereo- and enantioselectivities (up to
Synthesis of 1,3-dioxo-substituted allenes via copper(I)-catalyzed coupling of α-oxo-alkynes and α-oxo-diazos by controlling the sequence of adding substrates
作者:Chulong Liu、Yunxiang Weng、Xiaobao Zeng、Weiping Zheng、Xinyan Wang、Yuefei Hu
DOI:10.1016/j.tetlet.2019.01.015
日期:2019.2
A novel direct synthesis of 1,3-dioxo-substituted allenes was developed by copper(I)-catalyzed coupling of α-oxo-alkynes and α-oxo-diazos. It was a sequence of adding substrates-controlled method and the desired products were synthesized chemoselectively by adding α-oxo-alkyne terminally.
Bifunctional Phosphonium Salt‐catalyzed Enantioselective [4+2] Annulation of Isoindigos with Allenes: Access to Complex Heterocycles with Centerpiece of 4
<i>H</i>
‐Pyrans
作者:Juan Du、Jia‐Hong Wu、Lixiang Zhu、Xiaoyu Ren、Chunhui Jiang、Tianli Wang
DOI:10.1002/adsc.202000150
日期:2020.6.15
with promising biological activities, but have daunting synthetic challenges. Herein, we presented a regio‐ and stereoselective [4+2] annulation of isoindigo derivatives with allenes by bifunctional phosphonium catalysis. This protocol provides a complementary way for accessing complex heterocyclic compounds.