Synthesis of Allylic Isoprenoid Diphosphates by SN2 Displacement of Diethyl Phosphate
作者:Matthew M. Ravn、Qingwu Jin、Robert M. Coates
DOI:10.1002/(sici)1099-0690(200004)2000:8<1401::aid-ejoc1401>3.0.co;2-p
日期:2000.4
Allylic polyenyl diphosphates such as geranyl and (E,E,E)-geranylgeranyl diphosphates are ubiquitous substrates for monoterpene and diterpene synthases and transferases in isoprenoid biosynthesis. These enzyme substrates were prepared in asymmetrically labeled form by reduction of 1-deuterio aldehyde precursors with (R)- and (S)-Alpine boranes®, conversion into diethyl phosphates, and SN2 displacements
烯丙基多烯基二磷酸酯如香叶基和 (E,E,E)-香叶基香叶基二磷酸酯是类异戊二烯生物合成中单萜和二萜合酶和转移酶普遍存在的底物。这些酶底物是通过用 (R)-和 (S)-Alpine boranes® 还原 1-氘醛前体,转化为磷酸二乙酯,以及用焦磷酸三(四丁基铵)缓慢发生的 SN2 置换,以不对称标记的形式制备的在 2-5 天内完成配置反转。用去甲二醇 11、(15S)-[15-] 类似地制备了 8α-和 8β-羟基-17-nor 类似物(13 和 14)以及 13 的(15R)-氘标记形式2H1]-11 和 12 通过烯丙基羟基的区域选择性磷酸化和焦磷酸阴离子置换。SN2 置换前后氘标记香叶醇的构型和对映纯度,以及双环酮醇中间体 (15S)-[15-2H1]-15 的非对映纯度通过转化为 (1S)-莰酸酯和1H-NMR分析。氨基醇 18 类似地转化为氨基二磷酸 19, 15-aza-14