Synthesis and carbene decomposition of functionally substituted diazoacetic acid esters. 8. Cyanomethyl diazoacetate
摘要:
Diazoacetic acid cyanomethyl ester (1) was synthesized, and its chemical conversions were investigated. Catalytic denitration of compound 1 with Rh2-(OAc)4 in CH2Cl2 at 25-degrees-C in the presence of alkenes, dienes-1,3, and alkynes-1 afforded the corresponding cyclopropane- and cyclopropenecarboxylic-3 acid esters in yields of 80-85% and was almost independent of the type of unsaturated acceptor. Competitive interaction methods showed that compound 1 has a high reactivity toward terminal alkenes and alkynes, which is comparable to that of methyl and propargyl diazoacetates.
Synthesis and carbene decomposition of functionally substituted diazoacetic acid esters. 8. Cyanomethyl diazoacetate
摘要:
Diazoacetic acid cyanomethyl ester (1) was synthesized, and its chemical conversions were investigated. Catalytic denitration of compound 1 with Rh2-(OAc)4 in CH2Cl2 at 25-degrees-C in the presence of alkenes, dienes-1,3, and alkynes-1 afforded the corresponding cyclopropane- and cyclopropenecarboxylic-3 acid esters in yields of 80-85% and was almost independent of the type of unsaturated acceptor. Competitive interaction methods showed that compound 1 has a high reactivity toward terminal alkenes and alkynes, which is comparable to that of methyl and propargyl diazoacetates.
Rhodium(<scp>ii</scp>)-mediated reactions of thiobenzoylketene S,N-acetals with α-diazo carbonyl compounds: synthesis of 2-substituted 3-alkylamino-5-phenylthiophenes
作者:Hyun Min Song、Kyongtae Kim
DOI:10.1039/b203931a
日期:——
Treatment of 3-methylamino-3-methylsulfanyl-1-phenylpropenethione 1 with excess (2.5 equiv.)
α-diazo carbonyl compounds such as α-diazoketones and α-diazoesters in the presence of a catalytic amount of Rh(II) acetate in CH2Cl2 at rt gave 2-acyl- or 2-aroyl-3-methylamino-5-phenylthiophenes and alkyl 3-methylamino-5-phenylthiophene-2-carboxylates, respectively, as major products along with 1-phenyl-2-methylsulfanylethanones. The formation of the major products indicates that the carbenes or carbenoids generated interact initially with the thione sulfur of 1.
Synthesis and carbene decomposition of functionally substituted diazoacetic acid esters. 8. Cyanomethyl diazoacetate
作者:E. A. Shapiro、A. B. Dyatkin、O. M. Nefedov
DOI:10.1007/bf00869513
日期:1992.2
Diazoacetic acid cyanomethyl ester (1) was synthesized, and its chemical conversions were investigated. Catalytic denitration of compound 1 with Rh2-(OAc)4 in CH2Cl2 at 25-degrees-C in the presence of alkenes, dienes-1,3, and alkynes-1 afforded the corresponding cyclopropane- and cyclopropenecarboxylic-3 acid esters in yields of 80-85% and was almost independent of the type of unsaturated acceptor. Competitive interaction methods showed that compound 1 has a high reactivity toward terminal alkenes and alkynes, which is comparable to that of methyl and propargyl diazoacetates.