(2S,3R)-1-Fmoc-2-methyl-piperi

Synthesis of (2S, 4S, 5S)-5-(t-Butoxycarbonylamino)-4-(t-Butyldimethylsilyloxy)-2-Isopropyl-7-Methyl Octanoic Acid

In an effort to produce renm mhibttory peptides, the preparation of (2 S ,4 S ,5 S )-5-( t -Butoxycarbonylamino)-4-( t -butyldimethylsilyloxy)-2-isopropyl-7-methyl octanotc acid, 15 , was carried out ( 1 ). This pseudo-dipeptide was used

Synthesis of (2R, 3R, 4R, 5S)-5-tert-Butyloxycarbonylamino-3,4-Dihydroxy-2-1sopropyl-3,4-O,O-Isopropylidene-6-CyctohexyI-Hexanoic Acid

The dipeptidic dihydroxyethylene isostere (27, 3R , 4R , 5S )-5-tert -butyloxy-carbonylamino-3,4-dihydroxy-2-isopropyl-3,4-O,O -isoprop-ylidene-6-cyclohexyl-hexanoic acid, 15 , is a representative building block of an important class

异柠檬酸 isocitric acid

　　 　　异柠檬酸 isocitric acid柠檬酸的异构体，虽然量少，但广泛存在于生物界。在落地生根属（ Bryophyllum）等多汁植物的叶、或悬钩子类中特别多，生物能够利用的是 D型。是三羧酸循环中的一个成分。柠檬酸在鸟头酸酶的作用下可逆地生成异柠檬酸和顺鸟头酸。在异柠檬酸脱氢酶（ EC1． 1． 1． 41）的作用下变成 a-酮戊二酸，在异柠檬酸裂合酶（ isocitrate lyase， EC4． 1． 3． 1）的作用下变成琥珀酸与乙醛