An electrochemical synthesis of functionalized (aza)indolinesthrough dehydrogenative [3+2] annulation of arylamines with tethered alkenes has been developed. Previous reported syntheses through similar inter‐ and intramolecular annulation reactions required noble‐metal catalysts and are mostly limited to terminal alkenes or 1,3‐dienes. The electrosynthesis employs the easily available and inexpensive
Enantioselective Conjunctive Cross-Coupling of Bis(alkenyl)borates: A General Synthesis of Chiral Allylboron Reagents
作者:Emma K. Edelstein、Sheila Namirembe、James P. Morken
DOI:10.1021/jacs.7b01774
日期:2017.4.12
conjunctive cross-coupling is used for the synthesis of enantioenriched allylboron reagents. This reaction employs nonsymmetric bis(alkenyl)borates as substrates and appears to occur by a mechanism that involves selective activation of the less substituted alkene followed by migration of the more substituted alkene during the course of a Pd-induced metalate rearrangement.
array of functional group transformations. The unprecedented spiro B-N heterocycles prepared in this study have potential utility as buildingblocks for the synthesis of pharmaceuticals. Preliminary mechanisticstudies suggest that insertion of the alkylidene carbenes into the B-H bonds of the amine-borane adducts proceeds via a concerted process involving a three-membered-ring transition state.
Alkenylation and Arylation of Peptides via Ni-Catalyzed Reductive Coupling of α-<i>C</i>-Tosyl Peptides with Csp<sup>2</sup> Triflates/Halides
作者:Xianghua Tao、Guobin Ma、Yanhong Song、Yunrong Chen、Qun Qian、Deli Sun、Hegui Gong
DOI:10.1021/acs.orglett.1c02601
日期:2021.10.1
A Ni-catalyzed reductive cross-coupling between α-C-tosyl peptides and Csp2 triflates/halides has been developed. This protocol enables the formation of various unnatural di- and tripeptides containing vinyl and aryl side chains, and it expands the applications of Ni-catalyzed reductive cross-coupling in late-stage diversification of peptides.
已经开发了α-C-甲苯磺酰肽和 Csp 2三氟甲磺酸盐/卤化物之间的 Ni 催化还原交叉偶联。该协议能够形成各种含有乙烯基和芳基侧链的非天然二肽和三肽,并扩展了镍催化还原交叉偶联在肽后期多样化中的应用。
Iron‐Catalyzed Radical Activation Mechanism for Denitrogenative Rearrangement Over C(sp
<sup>3</sup>
)–H Amination
An iron‐catalyzed denitrogenative rearrangement of 1,2,3,4‐tetrazole is developed over the competitive C(sp3)–H amination. This catalytic rearrangement reaction follows an unprecedented metalloradical activation mechanism. Employing the developed method, a wide number of complex‐N‐heterocyclic product classes have been accessed. The synthetic utility of this radical activation method is showcased with