具有配体如P(2-呋喃基)3,PPh 2 C 6 F 5或AsPh 3的[Ir(cod)Cl] 2在醇存在下显示出对烯丙基磷酸羰基化的高催化活性,得到相应的β ,γ-不饱和酯。(E)-3-苯基-2-丙烯基磷酸二乙酯在EtOH存在下于100 kgC的初始一氧化碳压力为40 kg cm -2的羰基化反应得到(E)-4-苯基-3-丁烯酸乙酯收率达90%。否(Z获得)-异构体。不使用胺作为添加剂,反应进行顺利。在EtOH存在下磷酸2-链烯基二乙酯的羰基化反应得到(E)-和(Z)-3-链烯酸乙酯的混合物。起始原料的立体化学通过丢失顺-反插入一氧化碳的进iridiumcarbon键之前中间到π烯丙基铱的异构化。增加烯丙基系统在γ位上的取代基的空间体积,或增加初始一氧化碳压力,将增加对具有与起始原料相同的立体化学的产物的选择性。
具有配体如P(2-呋喃基)3,PPh 2 C 6 F 5或AsPh 3的[Ir(cod)Cl] 2在醇存在下显示出对烯丙基磷酸羰基化的高催化活性,得到相应的β ,γ-不饱和酯。(E)-3-苯基-2-丙烯基磷酸二乙酯在EtOH存在下于100 kgC的初始一氧化碳压力为40 kg cm -2的羰基化反应得到(E)-4-苯基-3-丁烯酸乙酯收率达90%。否(Z获得)-异构体。不使用胺作为添加剂,反应进行顺利。在EtOH存在下磷酸2-链烯基二乙酯的羰基化反应得到(E)-和(Z)-3-链烯酸乙酯的混合物。起始原料的立体化学通过丢失顺-反插入一氧化碳的进iridiumcarbon键之前中间到π烯丙基铱的异构化。增加烯丙基系统在γ位上的取代基的空间体积,或增加初始一氧化碳压力,将增加对具有与起始原料相同的立体化学的产物的选择性。
Highly Selective Synthesis of <i>Z</i>-Unsaturated Esters by Using New Horner−Emmons Reagents, Ethyl (Diarylphosphono)acetates
作者:Kaori Ando
DOI:10.1021/jo970057c
日期:1997.4.1
New Horner-Emmons reagents, ethyl (diarylphosphono)acetates 1, were prepared from triethyl phosphonoacetate, PCl(5), and the corresponding phenols. The reaction of 1 with several kinds of aldehydes in the presence of Triton B or NaH in THF solvent revealed that these reagents are useful for the synthesis of Z-unsaturated esters. Among the reagents examined, ethyl(di-o-tolylphosphono)-, [bis(o-ethylphenyl)phosphono]-
New polymer-supported phosphonate reagents for the synthesis of Z-α,β-unsaturated esters
作者:Kaori Ando、Yusaku Suzuki
DOI:10.1016/j.tetlet.2010.02.113
日期:2010.4
Newpolymer-supported phosphonate reagents have been prepared and evaluated for the synthesis of Z-α,β-unsaturated esters. High Z-selectivity was obtained using the reagent having two o-t-BuC6H4 groups.
Practical synthesis of Z-unsaturated esters by using a new Horner-Emmons reagent, ethyl diphenylphosphonoacetate
作者:Kaori Ando
DOI:10.1016/0040-4039(95)00726-s
日期:1995.6
A new Horner-Emmons reagent, ethyl diphenylphosphonoacetate 1 was prepared from triethylphosphonoacetate, PCl5, and phenol in 60% overall yield. Horner-Emmons reactions of 1 with aldehydes in the presence of Triton® B or NaH in THF gave the Z-unsaturated esters in 89–93% selectivity in almost quantitative yields. Furthermore, 1 showed up to 99% Z-selectivity under Still's condition (KHMDS/18-crown-6)
Convenient Preparations of (Diphenylphosphono)acetic Acid Esters and the Comparison of the <i>Z</i>-Selectivities of Their Horner−Wadsworth−Emmons Reaction with Aldehydes Depending on the Ester Moiety