important quaternary α-benzyl- and α-allyl-α-methylamino cyclobutanones in good to high yield, via a sequential one-pot methylation/sigmatropic rearrangement, has been accomplished for the first time. The quaternary α-alkyl-α-amino cyclobutanones could be further manipulated, affording synthetically interesting scaffolds such as highlysubstituted tryptamines and cyclobuta-fused indolines.
Defluorinative Carboimination of Trifluoromethyl Ketones
作者:Xiaolong Zhang、Yongquan Ning、Zhaohong Liu、Shuang Li、Giuseppe Zanoni、Xihe Bi
DOI:10.1021/acscatal.2c02434
日期:2022.8.5
intramolecular cascade process by integrating successive cleavage of the C–Fbond and formation of C–C and C═N bonds on a single molecule entity, which differs relevantly from the stepwise mechanism of reported carbodefluorination of CF3 groups. Mechanistic studies disclose that silver catalysis plays a critical role, particularly in the stages of C–Fbondcleavage and aza-Claisen rearrangement.
An efficient catalytic strategy toward the synthesis of N-substituted 3-methylindoles from inactive o-dihaloarenes and N-allylamines was developed by using a 1,3-bis(2,6-diisopropylphenyl)acenaphthoimidazol-2-ylidene (AnIPr)-ligated oxazoline palladacycle. It enabled a very broad substrate scope tolerating different functional groups, electronic properties, and steric bulkiness and afforded desired
A novel Fe-catalyzed fluorosulfonylation of alkenes with Na2S2O4 and N-fluorobenzenesulfonimide (NFSI) for assembling various lactam-functionalized alkyl sulfonyl fluorides is disclosed. In this reaction, Na2S2O4 acts as both an SO2 source and a reductant. Furthermore, the resulting products can be efficiently transformed into valuable chemicals, including sulfonyl esters and sulfonamides, via the
公开了一种新的Fe催化烯烃与Na 2 S 2 O 4和N-氟苯磺酰亚胺(NFSI)的氟磺酰化反应,用于组装各种内酰胺官能化的烷基磺酰氟。在该反应中,Na 2 S 2 O 4既充当SO 2源又充当还原剂。此外,通过六氟化硫交换(SuFEx)点击反应,所得产品可以有效转化为有价值的化学品,包括磺酰酯和磺酰胺。初步机理研究表明该转化通过分子内自由基环化、SO 2插入、亚硫酸根阴离子形成和氟化进行。
Allyl amines as ammonia equivalents in the preparation of anilines and heteroarylamines
作者:Saul Jaime-Figueroa、Yanzhou Liu、Joseph M. Muchowski、David G. Putman
DOI:10.1016/s0040-4039(97)10877-2
日期:1998.3
A series of anilines and heteroarylamines were synthesized in moderate to excellent yields by palladium catalyzed cross coupling reaction of aryl or heteroaryl halides with allyl-or N,N-diallylamine followed by deallylation. (C) 1998 Elsevier Science Ltd. All rights reserved.