Novel Isomerization Reaction of N,N-Dimethyl-α-(methoxycarbonyl)-4-substituted- benzylammonium N-Methylides
摘要:
Fluoride ion-induced desilylation of N,N-dimethyl-N-[(trimethylsilyl)methyl]-alpha-(methoxycarbonyl)- 4-substituted benzylammonium salts (7) gave two Stevens rearrangement products: methyl 3-(dimethylamino)-2-(4-substituted phenyl)propionates (13) from N-methylides 8, and methyl 3-(dimethylamino)-3-(4-substituted phenyl)propionates (15) from N-benzylides 10. Additional Stevens rearrangement products, methyl 2-(dimethylamino)-3-(4-substituted phenyl)propionates (16), were competitively formed from ylides 12 when the cesium fluoride used was not predried. The mechanism of the isomerization from methylides 8, which was initially generated, to 10 and 12 is discussed.
Novel Isomerization Reaction of N,N-Dimethyl-α-(methoxycarbonyl)-4-substituted- benzylammonium N-Methylides
摘要:
Fluoride ion-induced desilylation of N,N-dimethyl-N-[(trimethylsilyl)methyl]-alpha-(methoxycarbonyl)- 4-substituted benzylammonium salts (7) gave two Stevens rearrangement products: methyl 3-(dimethylamino)-2-(4-substituted phenyl)propionates (13) from N-methylides 8, and methyl 3-(dimethylamino)-3-(4-substituted phenyl)propionates (15) from N-benzylides 10. Additional Stevens rearrangement products, methyl 2-(dimethylamino)-3-(4-substituted phenyl)propionates (16), were competitively formed from ylides 12 when the cesium fluoride used was not predried. The mechanism of the isomerization from methylides 8, which was initially generated, to 10 and 12 is discussed.
Novel Isomerization Reaction of <i>N</i>,<i>N</i>-Dimethyl-α-(methoxycarbonyl)-4-substituted- benzylammonium <i>N</i>-Methylides
作者:Chen Zhang、Hiroto Ito、Yasuhiro Maeda、Naohiro Shirai、Shin-ichi Ikeda、Yoshiro Sato
DOI:10.1021/jo981729h
日期:1999.1.1
Fluoride ion-induced desilylation of N,N-dimethyl-N-[(trimethylsilyl)methyl]-alpha-(methoxycarbonyl)- 4-substituted benzylammonium salts (7) gave two Stevens rearrangement products: methyl 3-(dimethylamino)-2-(4-substituted phenyl)propionates (13) from N-methylides 8, and methyl 3-(dimethylamino)-3-(4-substituted phenyl)propionates (15) from N-benzylides 10. Additional Stevens rearrangement products, methyl 2-(dimethylamino)-3-(4-substituted phenyl)propionates (16), were competitively formed from ylides 12 when the cesium fluoride used was not predried. The mechanism of the isomerization from methylides 8, which was initially generated, to 10 and 12 is discussed.