Application of <sup>13</sup>C NMR Spectroscopy and <sup>13</sup>C-Labeled Benzylammonium Salts to the Study of Rearrangements of Ammonium Benzylides
作者:Tadeusz Zdrojewski、Andrzej Jończyk
DOI:10.1021/jo961231k
日期:1998.2.1
Ylides generated from N-(cyanomethyl)-N,N-dimethyl-N-[alpha-(trimethylsilyl)benzyl]ammonium chloride (4) and fluorideanion afford the products of [1,2] shift 11 and [2,3] shift 13. Formation of product 13 shows that, in the presence of water from TBAF, rearrangements and [1,3]H shift in ylide intermediates become competitive processes. The reaction of N-benzyl-N,N-dimethyl-N-[alpha-(trimethylsilyl)benzyl]ammonium
Generation and reaction of benzylammonium N-methylides with N-cyanomethyl or N-(ethoxycarbonylalkyl) groups
作者:Chen Zhang、Yasuhiro Maeda、Naohiro Shirai、Yoshiro Sato
DOI:10.1039/a605337h
日期:——
N-Cyanomethyl-, N-ethoxycarbonylmethyl- and
N-(3-ethoxycarbonylpropyl)-N-methylbenzylammonium
N-methylides 6a,b and 22 have been generated by fluoride
ion-induced desilylation of the corresponding
N-(trimethylsilylmethyl)benzylammonium salts 5a,b and 21.
Sommelet–Hauser 7, 23 and Stevens 8, 24 rearrangement products
were obtained from 6a and 22, but not from 6b.
Activation of benzylic amines towards regioselective metallation by borane complex formation
作者:Mark R. Ebden、Nigel S. Simpkins、David N.A. Fox
DOI:10.1016/0040-4039(95)01797-l
日期:1995.11
Formation of borane complexes of N, N-dimethylbenzylamine 4 and N methyltetrahydroisoquinoline 1 facilitates regioselective metallation of these systems using BuLi, giving benzylic anions which react with a range of electrophiles.
Electroreduction of aliphaticamides (RCONMe2) with Mg electrode in the presence of chlorotrimethylsilane (TMSCI) has been found to give the coupling products [R(TMSO)CC(NMe2)R] and hydrolysis of the products affords the corresponding α-amino ketones [RCOCH(NMe2)R] in excellent yields.
Lochmann–Schlosser base with all four components lithium, potassium, carbanion, and alkoxide led to the observation of new structural motifs with respect to these superbasic reagents. The “kick out” of a THF leads to the detachment, providing the typical Li/K reaction site, whereas the “smart pass” leads to the favorable THF-displacement and the K/K reaction site provided for substrates.