作者:Anyu He、Bingli Yan、Anchalee Thanavaro、Christopher D. Spilling、Nigam P. Rath
DOI:10.1021/jo0490090
日期:2004.12.1
their derivatives can be interconverted by using cross metathesis with second generation Grubbs catalyst. The absolute stereochemistry of the starting phosphonate is conserved in the product. Cross metathesis reaction of the acrolein-derived phosphonate 2a yields a series of functionalized allylic hydroxy phosphonates. However, the cross metathesis reaction is often accompanied by competing dimerization
烯丙基羟基膦酸酯及其衍生物可通过与第二代Grubbs催化剂进行交叉复分解而相互转化。起始膦酸酯的绝对立体化学在产物中是保守的。丙烯醛衍生的膦酸酯2a的交叉复分解反应产生一系列官能化的烯丙基羟基膦酸酯。然而,交叉复分解反应通常伴随竞争性二聚化和烯烃迁移反应,从而导致产率降低。还检查了肉桂醛和巴豆醛衍生的膦酸酯2b和2c。通常,膦酸酯2b和2c的复分解反应比膦酸酯的复分解反应要慢得多。2a导致混合。膦酸酯2a的几种羟基保护衍生物(碳酸甲酯3a,乙酸酯4a,氨基甲酸N-甲苯磺酯5a,TBDMS 6a和乙酰乙酸酯7a)进行复分解而不会发生竞争性副反应,从而以高至优异的收率得到取代的烯丙基膦酸酯。