The reaction of styrene and t-butyl α-diazoacetate in the presence of (R,R)-(ON+)(salen)ruthenium(II) complex 1 under the irradiation of incandescent light in THF gave the corresponding (1S,2R)-cyclopropanecarboxylate with high stereoselectivity of 99% ee (cis : trans = 96 : 4), while the same reaction in hexane gave the enantiomeric (1R,2S)-cyclopropanecarboxylate preferentially (83% ee, cis : trans = 68 : 32).
在THF中,在(R,R)-(ON+)(salen)
钌(II)复合物1的存在下,
苯乙烯与t-丁基α-二氮
乙酸酯在白炽灯照射下反应,生成相应的(1S,2R)-
环丙烷羧酸酯,具有99%的高立体选择性(顺式:反式 = 96:4)。而在
十六烷中进行相同反应则优先生成对映异构体(1R,2S)-
环丙烷羧酸酯(83% ee,顺式:反式 = 68:32)。