使用顺磁性钴(II)卟啉催化剂[Co II (TPP)](TPP=四苯基卟啉)对邻烯丙基羰基-芳基N-芳基磺酰腙进行金属自由基活化,为合成新型8元杂环化合物提供了一种有效且强大的方法烯醇醚。该合成方案通用且实用,能够以高产率合成多种独特的 1 H -2-苯并氧辛。催化环化反应具有优异的化学选择性,具有较高的官能团耐受性,并为合成新的生物活性化合物提供了多种机会。该反应通过钴(III)-卡宾自由基中间体进行,该中间体参与从烯丙基位置到卡宾自由基的分子内氢转移(HAT),然后在钴的配位层中进行近无障碍的自由基反弹步骤。所提出的机制得到了实验观察、密度泛函理论(DFT)计算和自旋捕获实验的支持。
作者:Simone M. Gillbard、Harley Green、Stephen P. Argent、Hon Wai Lam
DOI:10.1039/d1cc01166a
日期:——
Enantioselective nickel-catalyzed reactions of (hetero)arylboronic acids or alkenylboronic acids with substrates containing an alkyne tethered to various acyclic electron-deficient alkenes are described.
Enantioselective Copper(I)-Catalyzed Borylative Aldol Cyclizations of Enone Diones
作者:Alan R. Burns、Jorge Solana González、Hon Wai Lam
DOI:10.1002/anie.201205899
日期:2012.10.22
Piña colato? In the presence of a chiral CuI/bisphosphine complex and B2(pin)2, enone diones undergo diastereo‐ and enantioselective desymmetrization to deliver highly functionalized bicyclic products. The products can be used as substrates in additional transformations. pin=pinacolato, Cy=cyclohexyl.
Piñacolato?在存在手性Cu I /双膦配合物和B 2(pin)2的情况下,烯酮二酮会经历非对映异构和对映选择性去对称化,从而提供高度官能化的双环产物。该产品可用作其他转化的底物。销=松果醇,Cy =环己基。
[EN] DERIVATIVES OF PYRROLOIMIDAZOLE OR ANALOGUES THEREOF WHICH ARE USEFUL FOR THE TREATMENT OF INTER ALIA CANCER<br/>[FR] DÉRIVÉS DE PYRROLOIMIDAZOLE OU ANALOGUES DE CEUX-CI UTILES, ENTRE AUTRES, DANS LE TRAITEMENT DU CANCER
申请人:EMCURE PHARMACEUTICALS LTD
公开号:WO2017134555A1
公开(公告)日:2017-08-10
Present invention relates to novel heterocyclic compounds as indoleamine 2,3-dioxygenase (IDO) and/or tryptophan 2,3-dioxygenase (TDO) modulators. Compounds of the present invention inhibit tryptophan degradation by modulating IDO and/or TDO. Formula (I) The invention further relates to the process of their preparation, pharmaceutical composition and their use in modulating the activity of indoleamine 2,3-dioxygenase (IDO) and/or tryptophan 2,3- dioxygenase (TDO). The compounds of the invention can be used alone or in combination for the treatment of conditions that benefits from the inhibition of tryptophan degradation.
Hydrazine Hydrate in Asymmetric Synthesis: A Bifunctional Squaramide Catalytic Approach toward Fused Pyrazolines
作者:Dipankar Das、Chandan Kamilya、Prasanta Ghorai
DOI:10.1021/acs.orglett.3c02529
日期:2023.9.29
developed to utilize hydrazine hydrate in asymmetric organic synthesis by overcoming the rapid background reaction with dienone. The H-bond donor ability of the cinchona-alkaloid-derived squaramide catalyst unlocks this previously deemed infeasibility. The dissymmetric hydrazine addition to symmetrical dienones tolerates various substitutions, resulting in the formation of optically pure fused pyrazoline derivatives
Expedient Access to Enantioenriched 1‐Azaspiro Cyclobutanones Enabled by Modified Heyns Rearrangement
作者:Shibaram Panda、Prasanta Ghorai
DOI:10.1002/anie.202306179
日期:2023.8.7
4]-azaspirocycles by employing the Heyns reactivity upon its electrophilic modification. The chiral phosphoric acid is an efficient catalyst for this transformation and allows to access a wide range of cyclobutanone containing 1-azaspirocycles with excellent enantio- and diastereoselectivities.