1]nonan-2-one derivatives with four contiguous stereogenic centers, including one tetrasubstituted stereogenic center, was realized through an organocatalytic domino Michael-hemiacetalization-Michael reaction of (E)-3-aryl-2-nitroprop-2-enols and (E)-7-aryl-7-oxohept-5-enals followed by a PCC oxidation. Using the modularly designed organocatalysts (MDOs) self-assembled from cinchonaalkaloidderivatives and
One-Pot Sequential Organocatalysis: Highly Stereoselective Synthesis of Trisubstituted Cyclohexanols
作者:Qipu Dai、Hadi Arman、John Cong-Gui Zhao
DOI:10.1002/chem.201203104
日期:2013.1.28
>99:1) and enantioselective (ee value up to 96 %) synthesis of trisubstituted cyclohexanols was achieved by using a one‐pot sequentialorganocatalysis that involved a quinidine thiourea‐catalyzed tandem Henry–Michael reaction between nitromethane and 7‐oxo‐hept‐5‐en‐1‐als followed by a tetramethyl guanidine (TMG)‐catalyzed tandem retro‐Henry–Henry reaction on the reaction products of the tandem Henry–Michael
Highly Stereoselective Synthesis of Trisubstituted Cyclohexanols Using a Guanidine-Catalyzed Tandem Henry–Michael Reaction
作者:Qipu Dai、Huicai Huang、John Cong-Gui Zhao
DOI:10.1021/jo4001806
日期:2013.4.19
A highly diastereoselective (dr >99:1) and enantioselective (ee value up to 98%) synthesis of trisubstituted cyclohexanols was achieved by using a tandem Henry–-Michael reaction between nitromethane and 7-oxo-hept-5-enals catalyzed by the Misaki–Sugimura guanidine.
An asymmetricorganocatalytic annulation reaction of α-β-unsaturated imines derived from indoles with aldehydes leading to the formation of tetrahydro-α-carboline derivatives bearing N,O-acetals is described. A three-bond forming process, including the developed reaction affording tetracyclic architectures bearing four controlled stereocentres, is also reported.