Continuous-flow processes for the <i>S</i>-alkynylation of cysteine-containing peptides and thioglycosides under catalyst-free, oxidant-free and mild conditions
Selective S-alkynylation of cysteine-containing peptides and 1-thioglycoside residues was developed using continuous flow.
含半胱氨酸肽和1-硫代糖苷残基的选择性S-炔基化反应已经在连续流条件下开发。
Nickel-Catalyzed Enantioselective α-Alkenylation of <i>N</i>-Sulfonyl Amines: Modular Access to Chiral α-Branched Amines
作者:Lun Li、Yu-Cheng Liu、Hang Shi
DOI:10.1021/jacs.1c00622
日期:2021.3.24
α-branched amines are common structural motifs in functional materials, pharmaceuticals, and chiral catalysts. Therefore, developing efficient methods for preparing compounds with these privileged scaffolds is an important endeavor in synthetic chemistry. Herein, we describe an atom-economical, modular method for a nickel-catalyzed enantioselective α-alkenylation of readily available linear N-sulfonyl amines
Dual Gold/Silver Catalysis: Indolizines from 2-Substituted Pyridine Derivatives via a Tandem C(sp<sup>3</sup>)–H Alkynylation/Iminoauration
作者:Chunyu Han、Yaowen Liu、Xianhai Tian、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1021/acs.orglett.1c03667
日期:2021.12.17
A dual gold/silver-catalyzed cascade C(sp3)–H alkynylation/iminoauration of 2-substituted pyridines with hypervalent iodine(III) reagents for the synthesis of indolizines is described. This novel reaction involves the formation of an alkynyl Au(III) species, a dual gold/silver-catalyzed C(sp3)–H functionalization, and a subsequent iminoauration process. A number of indolizines bearing diverse functionalities
Cyclopropenation of internal alkynylsilanes and diazoacetates catalyzed by copper(<scp>i</scp>) N-heterocyclic carbene complexes
作者:Thomas J. Thomas、Benjamin A. Merritt、Betsegaw E. Lemma、Adina M. McKoy、Tri Nguyen、Andrew K. Swenson、Jeffrey L. Mills、Michael G. Coleman
DOI:10.1039/c5ob02259b
日期:——
Copper(I) N-heterocycliccarbene (CuNHC) complexes are more catalytically active than traditional transition metal salts for the cyclopropenation of internal alkynylsilanes and diazoacetate compounds. A series of 1,2,3-trisubstituted and 1,2,3,3-tetrasubstituted cyclopropenylsilane compounds were isolated in good overall yields. An interesting regioselective and chemodivergent reaction pathway was
Rapid consecutive three-component coupling-Fiesselmann synthesis of luminescent 2,4-disubstituted thiophenes and oligothiophenes
作者:Marco Teiber、Thomas J. J. Müller
DOI:10.1039/c2cc17548g
日期:——
(Hetero)aroyl chlorides, alkynes, and ethyl 2-mercapto acetate can be reacted in a consecutive three-component synthesis to give 2,4-disubstituted thiophene 5-carboxylates in good to excellent yields. In the sense of a pseudo-five-component reaction highly blue luminescent symmetrical terthiophenes and a quinquethiophene can be synthesized in excellent yield.