Synthesis of Aldehydes by Organocatalytic Formylation Reactions of Boronic Acids with Glyoxylic Acid
作者:He Huang、Chenguang Yu、Xiangmin Li、Yongqiang Zhang、Yueteng Zhang、Xiaobei Chen、Patrick S. Mariano、Hexin Xie、Wei Wang
DOI:10.1002/anie.201703127
日期:2017.7.3
Reported herein is a conceptually novel organocatalytic strategy for the formylation of boronic acids. New reactivity is engineered into the α‐amino‐acid‐forming Petasis reaction occurring between aryl boronic acids, amines, and glyoxylic acids to prepare aldehydes. The operational simplicity of the process and its ability to generate structurally diverse and valued aryl, heteroaryl, and α,β‐unsaturated
We report herein a highly exo-selectiveintramolecularDiels–Alderreaction of alkenyl boronates which employs an N–B dative bond-involved bicyclic rigid tether. Complex C(sp3)-rich polycyclic molecules containing up to 8 stereocenters can be readily formed via an operationally simple two-step procedure.
Stereospecific syntheses of the Z–E and E–Z vinylogues of combretastatin A-4, and two B-ring related analogues, were achieved through a Suzuki–Miyaura coupling. As compared to CA4, the derivative with a phenyl moiety has shown increased potency in its ability to inhibit tubulin polymerisation.
Organocatalytic Enantio- and Diastereoselective Synthesis of 1,2-Dihydronaphthalenes from Isobenzopyrylium Ions
作者:Hui Qian、Wanxiang Zhao、Zhaobin Wang、Jianwei Sun
DOI:10.1021/ja509824j
日期:2015.1.21
efficient asymmetricsynthesis of dihydronaphthalenes is disclosed. The process represents a new addition to the limited asymmetricreactions of isobenzopyryliums, a family of versatile 10π-electron aromatic species. Excellent asymmetric induction is achieved for the first time without an anchoring group in the 4-position or a metal catalyst, both of which were required previously in these reactions. The