伯胺在碱(例如DBU或TEA)的存在下与碳酸盐(Na 2 CO 3,K 2 CO 3,Cs 2 CO 3和Ag 2 CO 3)和卤代甲基环氧乙烷反应,以高收率得到恶唑烷酮。在这些碳酸盐中使用K 2 CO 3在该合成中获得了最佳的收率。提出了一种反应机理,即恶唑烷酮经由双环[2.2.1]中间体从恶嗪酮酮中间体获得。本反应可广泛用于方便地合成有用的N-取代的恶唑烷酮和手性恶唑烷酮。
FORMATION OF CARBAMATE DERIVATIVES BY REACTION OF CHLOROMETHYLOXIRANE OR PHENYLOXIRANE WITH CARBON DIOXIDE AND ALIPHATIC AMINES
作者:Takashi Asano、Norio Saito、Shota Ito、Kiyotaka Hatakeda、Takashi Toda
DOI:10.1246/cl.1978.311
日期:1978.3.5
Reactions of chloromethyloxirane or phenyloxirane with carbon dioxide and aliphaticamines in methanol afforded corresponding hydroxyoxazinone or hydroxycarbamate derivatives under mild conditions.
SAITO NORIO; HATAKEDA KIYOTAKA; ITO SYOTA; ASANO TAKASHI; TODA TAKASHI, J. CHEM. SOC. JAP., CHEM. AND IND. CHEM.,(1986) N 9, 1196-1201
作者:SAITO NORIO、 HATAKEDA KIYOTAKA、 ITO SYOTA、 ASANO TAKASHI、 TODA TAKASHI
DOI:——
日期:——
ASANO T.; SAITO N.; ITO S.; HATAKEDA K.; TODA T., CHEM. LETT., 1978, NO 3, 311-312
作者:ASANO T.、 SAITO N.、 ITO S.、 HATAKEDA K.、 TODA T.
DOI:——
日期:——
Switchable synthesis of cyclic carbamates by carbon dioxide fixation at atmospheric pressure
作者:Yasunori Toda、Minoru Shishido、Tatsuya Aoki、Kimiya Sukegawa、Hiroyuki Suga
DOI:10.1039/d1cc02493k
日期:——
base-promoted switchable synthesis of five- and six-membered cyclic carbamates using atmospheric pressure carbondioxide as the C1source was developed. The chemoselectivity of products was simply controlled by changing bases and solvents. The reaction proceeds effectively undermildconditions, affording valuable cyclic carbamates. Experimental results and DFT studies revealed the reaction mechanism.
Primaryamines reacted with carbonate salts (Na2CO3, K2CO3, Cs2CO3, and Ag2CO3) and halomethyloxiranes in the presence of a base such as DBU or TEA to give oxazolidinones in high yields. The use of K2CO3 among these carbonate gave the best yield in this synthesis. A reaction mechanism was proposed that the oxazolidinone was obtained from an oxazinanone intermediate via a bicyclo[2.2.1] intermediate
伯胺在碱(例如DBU或TEA)的存在下与碳酸盐(Na 2 CO 3,K 2 CO 3,Cs 2 CO 3和Ag 2 CO 3)和卤代甲基环氧乙烷反应,以高收率得到恶唑烷酮。在这些碳酸盐中使用K 2 CO 3在该合成中获得了最佳的收率。提出了一种反应机理,即恶唑烷酮经由双环[2.2.1]中间体从恶嗪酮酮中间体获得。本反应可广泛用于方便地合成有用的N-取代的恶唑烷酮和手性恶唑烷酮。