Reductive Cleavage Reaction of N, N'-, N, O- and N, S-Linked Alkylidene Compounds by Sodium Borohydride
作者:KUNIAKI SHIMIZU、KEIICHI ITO、MINORU SEKIYA
DOI:10.1248/cpb.22.1256
日期:——
Sodium borohydride reduction was undertaken with a variety of N, N'-, N, O- and N, S-linked alkylidene compounds in aqueous ethanolic medium at room temperature. It has been realized that reductive cleavage of one of these two alkylidene carbon-heteroatom bonds is generally effected in this reduction, disclosing which alkylidene bond is initially cleaved when the two bonds are different.
Synthesis of N-(Dialkylaminoalkyl)alcohols by Homogeneously Catalyzed Hydrogenolysis of Cyclic N,O-Acetals
作者:Vitali I. Tararov、Renat Kadyrov、Thomas H. Riermeier、Armin Börner
DOI:10.1055/s-2002-20039
日期:——
The homogeneously catalyzed hydrogenation of 1,3-ox-azolidines affording unsymmetrically substituted 2-N-(dialkylamino)ethanols is reported showing for the first time that Rh(I) catalysts based on chelating diphosphines can be advantageous for this reaction.
Thermal Rearrangement of some Oxazolidine<i>N</i>-Oxides. 2-Alkyl-6-aryl-3,4-dihydro-2<i>H</i>-1,5,2-dioxazines
作者:Shahrokh Saba、Patrick W. Domkowski、Fariborz Firooznia
DOI:10.1055/s-1990-27054
日期:——
3-Alkyl-2-aryloxazolidines are oxidized with 3-chloroperoxybenzoic acid to produce the corresponding oxazolidine N-oxides. These N-oxides undergo thermal rearrangement to give 2-alkyl-6- aryl-3,4-dihydro-2H-1,5,2-dioxazines in 55-85% yield.
Generation and Reactivity of α-Amino-Substituted Arylmethyllithium Organometallics
作者:Ugo Azzena、Luciano Pilo、Elisabetta Piras
DOI:10.1016/s0040-4020(00)00303-3
日期:2000.6
Reductive cleavage of open chain and cyclic α-N,N-dialkylamino-substituted benzyl alkyl ethers 1a–f with a dispersion of Li metal and a catalytic amount of naphthalene in THF, allowed easy access to a wide array of α-N,N-dialkylamino-substituted benzyllithium derivatives. Reaction of these organometallics with various electrophiles afforded the expected products in satisfactory yields.
Studies on Acetylenic Compounds. XXXIII. A New Synthetic Method for Aminoacetylenic Compounds.
作者:Issei Iwai、Yasuo Yura
DOI:10.1248/cpb.11.1049
日期:——
A new and convenient route for the synthesis of various kinds of aminoacetylenes has been devised with Grignard reaction of aminoethers using acetylenemagnesium bromide. In the various cases examined, the yields range was 26∼76%. Both N, N-di (2-propynyl) amine- an 1, 4-di (2-propynyl) piperazine derivatives could be produced by this reaction, but in latter N, N-di (2-propynyl) methylamine derivative due to low reactivity of N, N-bis (butoxymethyl) methylamine (III) the reaction time was prolonged. Furthermore, by this reaction acetylenic aminoalcohols were obtained from cyclic aminoethers.