页面9504.产品的结构3CC在表2中被发现是错误分配。我们感谢Phil Baran教授和Rafael Navratil博士提请我们注意此错误。正确的结构在类固醇的C-9位置(3cc',如下所示)包含额外的苯甲醇。随着分子量的变化,分离的产率为29%。支持信息。错误的结构和产量也出现在SI中的S20和S84页上。因此,第S20页上的HRMS条目应如下所示:“ C 19 H 18 F 3 O 5 S +(M–O + Na)+的HRMS(ESI-TOF)m / z415.0822,发现为415.0857”。此处提供了完整的校正后的SI。可从https://pubs.acs.org/doi/10.1021/jacs.1c00564免费获得支持信息。 实验细节(已更正)(PDF)实验详细信息(已更正)(PDF)无需订阅ACS Web Edition,即可获得大多数电子支持信息文件。此类文件可以按文
Ruthenium-Catalyzed C–H Hydroxylation in Aqueous Acid Enables Selective Functionalization of Amine Derivatives
作者:James B. C. Mack、John D. Gipson、J. Du Bois、Matthew S. Sigman
DOI:10.1021/jacs.7b05469
日期:2017.7.19
catalytic protocol for sp3 C-H hydroxylation is described. Reactions are performed in aqueous acid using a bis(bipyridine)Ru catalyst to enable oxidation of substrates possessing basic amine functional groups. Tertiary and benzylic C-H hydroxylation is strongly favored over N-oxidation for numerous amine derivatives. With terpene-derived substrates, similar trends in reactivity toward tertiary and benzylic
We report the first examples of ruthenium complexes cis-[(N4)RuIIICl2]+ and cis-[(N4)RuII(OH2)2]2+ supported by chiral tetradentate amine ligands (N4), together with a high-valent cis-dioxo complex cis-[(N4)RuVI(O)2]2+ supported by the chiral N4 ligand mcp (mcp = N,N′-dimethyl-N,N′-bis(pyridin-2-ylmethyl)cyclohexane-1,2-diamine). The X-ray crystal structures of cis-[(mcp)RuIIICl2](ClO4) (1a), cis-
我们报告了由手性四齿胺配体 (N 4 ) 支持的钌配合物cis -[(N 4 )Ru III Cl 2 ] +和cis -[(N 4 )Ru II (OH 2 ) 2 ] 2+的第一个例子,与手性N 4配体mcp ( mcp = N , N ' -二甲基-N _, N'-双(吡啶-2-基甲基)环己烷-1,2-二胺)。cis -[(mcp)Ru III Cl 2 ](ClO 4 ) ( 1a )、cis -[(Me 2 mcp)Ru III Cl 2 ]ClO 4 ( 2a ) 和cis -[(pdp )的 X 射线晶体结构)Ru III Cl 2 ](ClO 4 ) ( 3a ) (Me 2 mcp = N , N '-二甲基-N , N'-双((6-甲基吡啶-2-基)甲基)环己烷-1,2-二胺, pdp = 1,1'-双(吡啶-2-基甲基)-2,2'-联吡咯烷))配体以顺式-α构型与钌中心配位。在水溶液中,观察到cis
Facile Synthesis of N-Substituted Amides from Alcohols and Amides
作者:Yoshikazu Kitano、Iku Okada、Kazuhiro Chiba
DOI:10.1055/s-0032-1318477
日期:——
This method can be used for the efficient and practical synthesis of various N-substituted formamides without the use of unmanageable cyano compounds. A facile and versatile method for preparing N-substituted amidesfrom alcohols and amides using a Brønsted acid and an alkali metal halide has been developed. Treatment of tertiary alcohols and amides in the presence of an alkali metal halide or methanesulfonic
Steric and kinetic effects of changing solvent and reagent in grignard reactions on some 4-substituted cyclohexanones
作者:Claudia Cianetti、Giorgio Di Maio、Vito Pignatelli、Pietro Tagliatesta、Elisabetta Vecchi、Errico Zeuli
DOI:10.1016/s0040-4020(01)91842-3
日期:1983.1
stereochemistry and relative rates of Grignardreactions on some 4R-substituted cyclohexanones (R=tBu, Me, OMe. CO2Me, OCOPh and Cl) have been determined under two separate reaction conditions (MeMgI in C6H6 and MeMgCl in THF). The results of our studies indicate that substrates containing an ester group have a higher reaction order in Grignard rcactant than other groups when reactions were carried out in the aromatic
在两个单独的反应条件下(C 6 H 6中的MeMgI和在THF中的MeMgCl )确定了一些4R取代的环己酮(R = tBu,Me ,OMe。CO 2 Me,OCOPh和Cl)上格氏反应的立体化学和相对速率)。我们的研究结果表明,当在芳族溶剂中进行反应时,含酯基的底物在格氏试剂中的反应顺序要高于其他基团。对于在THF中进行的反应而言并非如此。假设含有极性基团(至少OMe和Cl)的化合物通过在轴向构象中具有该基团的过渡态发生反应,则可以更好地理解立体化学产物比率和相对反应速率。
Electrochemical Ruthenium-Catalyzed C–H Hydroxylation of Amine Derivatives in Aqueous Acid
作者:Sophia G. Robinson、James B. C. Mack、Sara N. Alektiar、J. Du Bois、Matthew S. Sigman
DOI:10.1021/acs.orglett.0c01313
日期:2020.9.18
The development of an electrochemically driven, ruthenium-catalyzed C–H hydroxylation reaction of amine-derived substrates bearing tertiary C–H bonds is described. The reaction is performed under constant current electrolysis in a divided cell to afford alcohol products in yields comparable to those of our previously reported process, which requires the use of stoichiometric H5IO6 for catalytic turnover