A Deprotonation Approach to the Unprecedented Amino‐Trimethylenemethane Chemistry: Regio‐, Diastereo‐, and Enantioselective Synthesis of Complex Amino Cycles
作者:Barry M. Trost、Youliang Wang
DOI:10.1002/anie.201805876
日期:2018.8.20
The first realization of the amino‐trimethylenemethane chemistry is reported using a deprotonation strategy to simplify the synthesis of the amino‐trimethylenemethane donor in two steps from commercial and inexpensive materials. A broad scope of cycloaddition acceptors (seven different classes) participated in the chemistry, chemo‐, regio‐, diastereo‐, and enantioselectively generating various types
作者:Sasan Karimi、Shuai Ma、Yanan Liu、Keith Ramig、Edyta M. Greer、Kitae Kwon、William F. Berkowitz、Gopal Subramaniam
DOI:10.1016/j.tetlet.2017.04.077
日期:2017.6
approach has been employed to synthesize a variety of indole and carbazole derivatives from nitroarenes, surprisingly, very little is reported for making pyrroles using the same approach from non-arene nitrodienes. Herein, we report a general method to synthesize substituted pyrroles, in one step with modest yields, from nitrodienes using triphenylphosphine in the presence of an Mo catalyst, bis(acetyl
Facile Construction of Vicinal Quaternary and Tertiary Stereocenters via Regio- and Stereoselective Organocatalytic Michael Addition to Nitrodienes
作者:Pankaj Chauhan、Swapandeep Singh Chimni
DOI:10.1002/adsc.201100618
日期:2011.11
protocol for the synthesis of vicinal quaternary and tertiary stereocenters has been developed. The 6′-OH Cinchona alkaloids (BnCPN or BnCPD) at low catalyst loading (0.5–5 mol%) catalyze the Michaeladdition of trisubstituted carbon nucleophiles to nitrodienes in good to excellent yield (up to >99), high enantioselectivity (up to 99% ee) and high diastereoselectivity (up to >99:1 dr) under mild reaction
Organocatalytic asymmetric domino Michael–Henry reaction for the synthesis of substituted bicyclo[3.2.1]octan-2-ones
作者:Michail Tsakos、Mark R. J. Elsegood、Christoforos G. Kokotos
DOI:10.1039/c3cc39165e
日期:——
The first organocatalyticasymmetricreaction between 1,4-cyclohexanedione and nitroalkenes has been studied, affording bicyclo[3.2.1]octane derivatives containing four continuous stereogenic centres. The products were obtained through a domino Michael-Henry process as a single diastereoisomer with excellent enantioselectivities.
Visible Light Mediated C(sp<sup>3</sup>)‐H Alkenylation of Cyclic Ethers Enabled by Aryl Ketone
作者:Mengmeng Zhang、Liming Yang、Hui Yang、Guanghui An、Guangming Li
DOI:10.1002/cctc.201802079
日期:2019.3.20
C−H alkenylation of cyclicethers (THF, 1,4‐dioxane) using the readily available nitroalkenes as the alkenylating reagents has been developed. It allows the rapid access to the α‐alkenyl ethers with high E‐selectivity. The previous inaccessible α‐dienyl ethers are successfully obtained. Acyclic ether can also participate in this alkenylation process. The mechanism study reveals that alkenylation proceeded