A very mild, catalytic and versatile procedure for α-oxidation of ketone silyl enol ethers using (salen)manganese(III) complexes; a new, chiral complex giving asymmetric induction. A possible model for selective biochemical oxidative reactions through enol formation
通过将(+)-和(-)-酒石酸的两个对映异构体分别环化和还原,获得手性的1-烷基-3,4-二羟基吡咯烷(S,S)-和(R,R)-5。同样,由(+)-酒石酸二乙酯制备(S,S)-3,4-二羟基四氢呋喃6。所有这些杂环vic- diols均进行了两次Mitsunobu反应(Ph 3 P / DEAD / HN 3),然后进行催化加氢形成立体定向,形成相应的主要邻位二胺(R,R)-,(S,S)-2和(R,R )-3。二胺2、3的绝对构型是通过其N,N'-二邻苯二甲酰基衍生物的激子耦合CD光谱确定的。
The novel pyrrolidine-based aminosulfonamides (R,R)-2, (S)-3, and (S)-4 were designed and synthesized as organocatalysts and successfully applied for the anti-selective directasymmetricMannichreaction.
Design of a C2-symmetric chiral pyrrolidine-based amino sulfonamide: application to anti-selective direct asymmetric Mannich reactions
作者:Taichi Kano、Yoshio Hato、Keiji Maruoka
DOI:10.1016/j.tetlet.2006.09.147
日期:2006.11
The anti-selective directasymmetricMannichreaction was found to be efficiently catalyzed by the novel pyrrolidine-based aminosulfonamide (R,R)-2 prepared from l-tartaric acid.
The present invention relates to a class of TrkA inhibitors and an application thereof in the preparation of a drug for the treatment of diseases associated with TrkA. The present invention specifically discloses compounds represented by formula (I) and formula (II), tautomer thereof or pharmaceutically acceptable salts thereof.
Combinatorial Chemistry for Ligand Development in Catalysis: Synthesis and Catalysis Screening of Peptidosulfonamide Tweezers on the Solid Phase
作者:Arwin J. Brouwer、Heiko J. van der Linden、Rob M. J. Liskamp
DOI:10.1021/jo991628z
日期:2000.3.1
16a-e) was synthesized on the solid phase. This library was screened in a simultaneous substrate screening procedure for the ability to enantioselectively catalyze the Ti(O-i-Pr)(4)-mediated addition of diethylzinc to aldehydes. One of the best solid-phase tweezer catalyst (i.e., 16d, giving an ee of 32% in solid-phase catalysis) was resynthesized in solution (compounds 20 and 21). The now homogeneous solution-phase
Evidence for the formation of an ovoid chiral cage, resulting from the auto-assembly of two hexafunctional and three tetrafunctional modules reacting through dynamic covalent bond formation, is provided.