The reaction of methyl diazoacetate with 4,4-dimethyl-2-pentyn-1-al and related compounds
作者:A.S. Medvedeva、M.M. Demina、A.I. Borisova、O.I. Margorskaya、I.D. Kalikhman、E.I. Brodskaya、N.S. Vyazankin
DOI:10.1016/s0022-328x(00)81949-x
日期:1982.5
Methyl 2-diazo-3-hydroxy-6,6-dimethyl-4-heptynoate was prepared by treating 4,4-dimethyl-2-pentyn-1-al with methyl diazoacetate at room temperature in the absence of catalysts. In the case of related aldehydes, RCCCHO (R = n-Bu, Me3Si, Et3Si, Et3Ge), this unusual reaction is partially or completely suppressed by a competing 1,3-cycloaddition process. The latter leads to a mixture of isomeric 3- and
通过在不存在催化剂的情况下在室温下用重氮乙酸甲酯处理4,4-二甲基-2-戊炔-1-α,来制备2-重氮-3-羟基-6,6-二甲基-4-庚酸甲酯。在相关的醛RCCCHO(R = n-Bu,Me 3 Si,Et 3 Si,Et 3 Ge)的情况下,这种异常反应被竞争的1,3-环加成过程部分或完全抑制。后者导致异构体3-和4-甲酰基吡唑的混合物,其中一种被丙二聚化而形成三环半缩醛。